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Today in science: Albert Einstein and E=mc2

Mass and energy are interchangeable.

It’s Mid-Autumn Festival time in Asia

In China and other Asian countries, it’s sometimes called the Moon Festival in honor of the upcoming full moon.

Today in science: A moon for Mars

American astronomer Asaph Hall discovered Phobos, 1 of the 2 known Martian moons, on this date in 1877.

It’s summer. What’s noon to you?

What do you mean by noon? Do you define it by your clock or wristwatch? Or the gnawing in your stomach? Here’s how astronomers think about noontime.

Celebrate the solstice with this cool solargraph

The streaks in the photos are sun-trails – that is, they’re the sun moving in its shifting path across our sky from day to day over a 6-month period.

Summer solstice tale of 2 cities

On the June solstice, the sun will set at the same time in New York City and St. Augustine, Florida. But New York will have an hour more of daylight. How’s that happen?

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You can’t walk on these cloud streets

Cloud streets are long rows of cumulus clouds oriented parallel to the direction of the wind. Check out these cool images!

What is a coronal mass ejection?

Want to brush up on your knowledge about these solar hiccups – CMEs, for short – that can ripple through our solar system and can interrupt satellites and power grids on Earth?

When is the next leap year?

If there were no leap years, eventually February would be a summer month for the Northern Hemisphere. 2018 isn’t a leap year, but 2020 will be.

Top 10 reasons we fall in love

On this Valentine’s Day 2018, what the world of science suggests about the mystery we call love.

A Carolina chickadee with a juicy caterpillar. Photo courtesy of Desiree Narango and Doug Tallamy.

Want birds in your yard? Plant native trees

A recently published study confirms that native trees are most effective in hosting caterpillars, an important food for birds.

Happy Friday the 13th

When a common year of 365 days starts on a Sunday, as it did this year, 2 Friday the 13ths are inevitable. The 1st one was in January and the 2nd in October.

Largest-ever Gulf of Mexico dead zone

For 32 years, scientists have tracked the oxygen-depleted waters that appear each summer in the Gulf of Mexico. This year’s dead zone is the biggest yet.

Solar eclipse marked beginning of Iroquois Confederacy

A total solar eclipse of August 22, 1142 may have coincided with the birth of the Iroquois Confederacy, oldest democracy in North America and possibly on Earth.

Video: Moon hoax not

SG Collins explains why the Apollo moon landings on the moon in the late 1960s and early ’70s couldn’t have been faked.

Today in science: Bingham Canyon landslide

On April 10, 2013, one of the largest non-volcanic landslides in the history of North America took place at the Bingham Canyon mine in Utah.

A Chinese perspective on spring

In Chinese thought, spring is associated with the direction east, the sunrise direction as Earth spins us toward the beginning of each new day.

How many eclipses in 1 calendar year?

Every calendar year has at least 4, but 5, 6 or even 7 eclipses are also possible. Why don’t we see them all?

What is retrograde motion?

Retrograde motion of Jupiter or Mars or Saturn in our sky is an illusion, caused by Earth’s passing these slower-moving outer worlds. But there’s a real retrograde motion, too.

Today in science: Quasar mystery solved

In 1963, Maarten Schmidt suddenly realized that quasars are exceedingly distant and unimaginably luminous. His revelation changed our notion of what the universe is like.