The Science Behind Groundhog Day!

Image Source: Pixabay.com

Every February 2, Punxsutawney Phil emerges from his burrow in seek of his shadow. The viewing of his shadow predicts whether Winter will be prolonged or cut short to an early Spring. This year, 2017, Phil has seen his shadow and predicts that there will be 6 more weeks of winter. But what kind of science is there behind this type of weather prediction from the famous rodent? 

Groundhogs can’t actually tell us when the change in seasons will happen. But scientists that study the ecology and evolution of the groundhog note that male groundhogs have popped out of their burrows each and every February, to check things out and decide whether or not they should start waking up the female groundhogs to mate. Thus, indicating that Spring is near. 

A longtime study done by Ken Armitage, a professor at the University of Kansas, states that the rodents are now emerging about a month earlier in the spring than they did 30 or 40 years ago. Ken says, “understanding how individual groundhogs respond to environmental change is essential if we want to predict how animals will react to global warming and other human-driven habitat shifts.”

Animal behaviors have been observed for a very long time. For many years people have looked for clues to changes in the weather. The reappearance of hibernating animals like badgers, hedgehogs and even bears was a sign of winter’s end. When German settlers came to Pennsylvania in the 1700s, they chose the groundhog as the local announcer of spring. Even today, we watch for animals to indicate the change of seasons. Geese flying south is a sure sign of fall. In the Midwest and Northeast, we wait for the first robin of spring. 

So do you believe that Punxsutawney Phil’s prediction of 6 more weeks of winter is true? I guess we shall all have to just wait and see! 

Try some of these Fun, At Home, Shadow science experiments with your kids today: https://www.pinterest.com/hthtworldwide/groundhog-day-science/

Image Source: Pixabay.com

Fluid-filled Devices Created and Inspired by Legos

There are tools used for manipulating tiny amounts of liquid, known as microfluidic devices. Typically these devices are used to stimulate human blood cells or other biological features, perform blood tests, or even detect contaminants in human blood. Microfluidic devices  are used by the biomedical field as it allows many medical tests to be accomplished on a single chip. Microfluidic devices can also be used for drug screening, glucose tests and many other purposes.

Microfluidic Device. Image Source: By National Institute of Standards and Technology, via Wikimedia Commons

However, fabricating these microfluidic devices is not easy. It requires a different configuration of interior passages, demanding a brand new design that must be molded or 3-D printed each time. In a recent report by the Journal of Micromechanics & Microengineering states that “Scientists from the University of California, Irvine have created Lego-style blocks out of a polymer called PDMS. Their bricks contained minuscule channels, half a millimeter wide, that allowed liquid to flow from brick to brick with no leaks. New devices could be created quickly by rearranging standard blocks into various configurations.”

This new technology makes it easier for scientists to create these microfluidic devices more quickly and ready for use! Check out the Tweet below from Science News to see what the fluid-ferrying Lego devices look like!

Source: https://www.sciencenews.org/blog/science-ticker/construction-tiny-fluid-filled-devices-inspired-legos?tgt=nr

California’s Pioneer Cabin Tree aka “Tunnel Tree” has fallen.

Pioneer Cabin Tree - Image Source: By NX1Z via Wikimedia Commons

The Pioneer Cabin Tree also known as the “Tunnel Tree” to many, was a giant ancient sequoia with a hollowed-out tunnel through it’s base that resided in the Calaveras Big Trees State Park in California. This tree was hollowed-out to help increase tourism to the park during the 1880’s. Ultimately it drew thousands of visitors each year in California. This impressive and historic tree sadly toppled over on Sunday, January 8, 2017 during a period of heavy rains. 

Cars were once allowed to drive through the Tunnel Tree for a period of time. But in recent decades the tunnel was only accessible to hikers on a 1.5-mile loop in the park. 

The Pioneer Cabin tree was one of several “tunnel trees” that had been carved out and served as human amusements. The Wawona tree, in the Mariposa Grove at Yosemite National Park, was cut open in 1881. It fell down during a winter storm in 1969 and has been known as the Fallen Tunnel Tree since then. It was more than 2,000 years old when it fell.

Wawona Tree in 1982. Image Source: By Editor ASC Robert J. Boser via Wikimedia Commons

The Chandelier tree lives in a private Redwood grove in Leggett, CA which is north of San Francisco. The public is allowed to drive through the tree’s carved-out opening for a fee.

Chandelier Tree in Leggett, CA. Image Source: By Jled12 via Wikimedia Commons

Sequoias are known as the largest tree species in the world. They can reach diameters up to 27 feet and have shallow root systems that make them vulnerable to toppling. The oldest known giant sequoia based on ring count is 3,500 years old. The giant sequoia is usually found in a humid climate characterized by dry summers and snowy winters. And they typically grow best in an elevation of 4,600–6,600 ft.

For more information regarding the Pioneer Cabin Tree’s toppling please visit this link

2016 will have an extra second added to the end of it…

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Sorry to tell you HTHT Followers, 2016 will have an extra second added to the end of it!

Many of our favorite celebrities and scientists have passed away, the planet is becoming warmer everyday, and now, scientists will be adding an extra second onto 2016 on New Years Eve.

As you finally count down the end of 2016, you’ll have to make it past 11:59:60, thanks to the addition of an extra ‘leap second’. The extra second in the last minute of the year, means the final minute of 2016 will last for 61 seconds. These leap seconds are added to make up for the fact that Earth’s rotation is gradually slowing down, and to make sure that our precise clocks remain in sync with how long a day lasts on Earth.

“This extra second, or leap second, makes it possible to align astronomical time, which is irregular and determined by Earth’s rotation, with Coordinated Universal Time (UTC) which is extremely stable and has been determined by atomic clocks since 1967,” explained the Paris Observatory in France, which houses the International Earth Rotation and Reference Systems Service (IERS), responsible for synchronizing time.

So why do we need leap seconds at all?

The same reason that we add leap days to certain years. 2016 may have felt extra long because this year had a leap day and now a leap second!

Earth’s rotation fluctuates slightly year to year, sometimes getting longer, sometimes shorter. The spin is also influenced by geological events such as strong earthquakes, and even the freezing and melting of ice sheets. So by adding a leap day or leap seconds we can accommodate for those fluctuations caused by Earth’s rotations.

If there were no leap seconds, we would find ourselves to be 2 or 3 minutes out of sync with the position of the Sun by the year 2100.

Image Source: Pixabay.com

 

So if you want to ring in the New Year 2017 off at the right time….

make sure you adjust for that extra leap second!

The Winter Solstice 2016!

Winter Solstice- Image Source: Pixabay.com

Winter solstice 2016 in Northern Hemisphere was at 5:44 AM on Wednesday, December 21. 

The term solstice comes from the Latin word solstitium, meaning ‘the Sun stands still’. This is because on this day, the Sun reaches its southern-most position as seen from the Earth. The Sun seems to stand still at the Tropic of Capricorn and then reverses its direction.

During winter in the Northern Hemisphere, the Earth is actually closest to the Sun. Different seasons are not defined by how far the Earth is from the Sun. Seasons occur because Earth orbits the Sun on a slant, with an axial tilt of around 23.4 degrees. Therefore different amounts of sunlight reaches the Northern and Southern Hemispheres, causing variation in temperatures and weather patterns throughout the year.

For more information check out this informative video on the summer and winter solstice:

Top 10 Trending Science Gifts for 2016!

Not sure what to get for your science lover in the family this year for Christmas? Take a look at some of these trending science toys and gifts below, they will surely be a hit!

1. Micro Magnets*:

*These are not suitable for young children!

You can purchase the MicroMagnets from Zen Magnets Here!

2. Project MC2 Ultimate Lab Kit:

For more Project MC2 gifts check out these links:

H2O Powered RC Car: https://youtu.be/1JFBHwtnogc

Ultimate Spy Bag: https://youtu.be/H0Q4xvceZ_I

A.D.I.S.N Journal: https://youtu.be/1kUaKYp_XRE

You can find these Project MC2 Kits Here!

3. Ozobot Robot:

You can Buy the Ozobot Here!

4. Makey Makey: An Invention Kit for Everyone:

You can Buy the Makey Makey here!

5. Gravity Maze:

Get Your Gravity Maze Here!

6. View Master – Virtual Reality Headset: 

Get the View Master Headset Here!

7. Crayola Color Alive Easy Animation Studio:

You Can Purchase the Crayola Easy Animator Kit Here!

8. Hot Ice Crystals: 

You can buy the Hot Ice Crystals Science Kit Here!

9. Kinetic Sand: 

Buy Kinetic Sand on Amazon.com!

10. Energy Stick: 

Buy the Steve Spangler Energy Stick Here! 

The Story of Super Moons

Image source: Pixabay.com

What is a Super Moon?

So, the term “super moon” is actually a layman’s term for what astrologers call a perigee-syzygy of the Earth–Moon–Sun system.  Perigee is the point at which the Moon is closest to Earth in its orbit. Syzygy is when the Earth, Moon and Sun are all aligned, which of course happens whenever there is a full moon. Therefore perigee-syzygy is a coincidental combination of those conditions.  In other words, when the moon is full and at the point of its orbit that is closest to earth you get to see a super moon!

Tracking the Moon’s orbit; how does it work?

As the Moon orbits around the earth, its path is elliptical rather than circular.  So, there are points when the Moon is the furthest from Earth (apogee) and the closest (perigee).  The Earth and the Moon together orbit around the Sun and their position to each other relative to their orbit and individual rotation is how you get the phases of the moon, lunar eclipses, and solar eclipses.  The elliptical shape of Earth’s orbit and the tilt of Earth’s axis is how you get seasons.  The gravitational attraction that the Moon exerts on Earth is also how you get the movement of tides.  Although some have speculated that full moons and super moons have a greater effect on tides, natural disasters, and even human behavior, there is little scientific evidence to support this.  There is plenty of anecdotal evidence though if you talk to nurses, teachers, and moms!

Image source: Pixabay.com

Join our HTHT @ Home Science Experiment to make your own OREO Phases of the Moon:
https://sciencemadefun.net/downloads/oreo_phases_moon.pdf

Why So Few? Women in STEM

, via Wikimedia Commons”]Not that long ago, girls were actively discouraged from careers in science, technology, engineering and math. And women’s representation in STEM fields reflected this. In the 1960s, for instance, just one in every 100 engineers was a woman. The situation has improved, but today, women still make up only 27 percent of people working in science and engineering.

According to the U.S. Bureau of Labor Statistics, women make up 47 percent of the total U.S. workforce, but are much less represented in particular science and engineering occupations. They comprise 39 percent of chemists and material scientists, 28 percent of environmental scientists and geoscientists, 16 percent of chemical engineers and just 12 percent of civil engineers.

So what can be done? Perhaps we can encourage movie and tv directors to cast more women in STEM roles on television shows and movies. Pushing important STEM organizations, like NASA and others, to report on their internal demographics would make the issue more public and would have a big impact.

Here is some advice from women in STEM fields for girls who also want to pursue a career in these areas: Follow your passion, work hard, ignore the doubters and find peers who are just as into STEM as you are.

Follow this link to see some awesome women who work in a STEM related fields from all over the world:

https://www.sciencenewsforstudents.org/blog/eureka-lab/women-stem-reach-stars

Pumpkin Science on National Pumpkin Day!

Image Source: Pixabay.com

It’s that time of year again where the leaves are changing colors, little graveyards are popping up in neighborhoods and millions of pumpkins are going through a metamorphosis to become jack-o’-lanterns. It’s Halloween time! 

There are some interesting facts and science about the pumpkin.  In history, it was said that the jack-o-lantern was to fend of any evil spirits. Of course, there is no science of any kind to back up evil spirits being chased away by jack-o’-lanterns. BUT, scientists have found that pumpkins have a lot of science associated with them.

Here are some examples:

 

Image Source: Pixabay.com

Pollution Plucker

Scientists have found that pumpkins are incredibly good at taking pollution out of soil! When the scientists planted pumpkins on test areas polluted by dioxin, the large pumpkin plants pulled up the dioxin and deposited it into the plant. Leaving less of the pollutant in the soil and ultimately making the soil pollutant free!

 

 

 

Image Source: Pixabay.com

Pumpkin Antimicrobial 

Scientists from the American Chemical Society found that a substance in pumpkin skin fights off disease-causing microbes that try to harm and rot the pumpkin. Without that protective skin, the pumpkin would surely rot long before it was time to carve it. Later, scientists took out proteins from the pumpkin skins, and found that the proteins stopped not only infections in pumpkins but also some common human infections! 

 

 

Image Source: Pixabay.com


Pumpkin Genetics 

Growing the biggest pumpkin has become a popular sport among some farmers — it takes some science for the farmer to grow that monster pumpkin! They use genetics in order to grow bigger pumpkins. They do this by collecting the seeds from giant pumpkins each year and controlling how the flowers are pollinated. Winning pumpkins have weighed in at more than 2,000 pounds!

 

Check out the world’s heaviest pumpkin here: http://www.nbcnews.com/news/world/worlds-heaviest-pumpkin-tips-scales-2-096-pounds-n213846

 

For some fun at home pumpkin science experiments to try with your kids,

please visit our Pinterest page: 

https://www.pinterest.com/hthtworldwide/fall-fun-science/

This Color Night Light Is Best For Sleep – The Color Will Surprise You!

If you have to sleep with a night light on you might think that blue and white lights might create a calming sensation and help you sleep best. However, a new study  involving hamsters suggests that blue light had  worst effects on mood, followed closely by white light. So what is the best color for night lights? The answer will  surprise you!

RED!

Image Source: Makezine.com

The hamsters exposed to red light at night had significantly less evidence of depressive-like symptoms and changes in the brain linked to depression, compared to those that experienced blue or white light. However, total darkness at bedtime is still best for sleep.

So why is the color red a better light for at night?

Specialized photosensitive cells called ipRGC’s are located in the retina of our eyes. These cells are able to detect any light and send messages to a part of the brain that helps regulate the body’s circadian clock. This is the body’s master clock that helps determine when people feel sleepy and awake. These ipRGC cells are most sensitive to blue wavelengths of light and least sensitive to red wavelengths.

In nearly every measure of this study, the hamsters exposed to blue light were the worst off, followed by those exposed to white light. While total darkness was best, red light was not nearly as bad as the other wavelengths studied.

In Conclusion

So if you need a night light in the bathroom or bedroom, it may be better to have one that gives off red light rather than white light! Why not give it a try at home and experiment on how the change in color makes you feel! Also, make sure to download an app on your wireless devices to emit red light a few hours before bedtime. A few examples of apps you can download are Twilight (android), Flux (iOS, Mac).

Check Out this Informative Video:

Sources:

http://www.science20.com/news_articles/one_color_night_light_best_sleep_color_will_surprise_you-117929

http://www.huffingtonpost.com/2014/11/12/nightlight-color-better-sleep_n_6142098.html