How can you time 45 minutes with 2 sticks that each burn for one hour?

Wanna know all the reasons Mars will kill you and how we know? I hit up my friend Raquel Nuno who's a planetary geologist to find out.

What if you could power a ship using sunlight instead of wind? Well in space, you can! Solar sails or light sails are pushed with light from the sun. Photons provide a kick when they reflect off the sail pushing the sail like an air...

Are there any dangers associated with receiving an MRI and how exactly does an MRI work? Is it safe? Medical imaging, specifically magnetic resonance imaging (MRI), has come so far that we can create high resolution images of the entire...

How did you answer the spool riddle?

Would you take a trip to Mars knowing the risks? What if it were a one way trip? Should we colonize Mars? I took a trip over to the Planetary Society to meet with CEO and Science Guy, Bill Nye to discuss the potential for future human...

Dianna from Physics Girl makes DIY crazy vortex ring shapes with Grant Sanderson from 3blue1brown

The mantis shrimp punch is fast enough to boil water! How much force do they create, and how is physics preventing them from being any faster? Find out how mantis shrimp cause cavitation!

5 of the most unusual, amazing and interesting stars we've discovered in our universe. Red giants, supernovas, hybrid stars, orbiting binaries, large stars, old stars, small stars, we've discovered thousands of stars within our milky way...

Astronomers have seen light from BEHIND a black hole for the first time. I explained the discovery and results to my editor, Levi. Congrats to D. Wilkins and the astronomy team!

What is the universe expanding into? Where did the big bang happen?

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Why are plants green? Is there a reason plants evolved to be green, globally? What does it have to do with the color of the sunlight coming down through our atmosphere?

See if you can solve the next two riddles in this video: (1) the silent round riddle (2) the broom riddle ft. Kurt Hugo Schneider!

How does a touchscreen work? Why can you text with your finger, but not with a q-tip? The physics of smartphones is a complicated and amazing mixture of engineering, physics, electronics and computer science. Topics: Capacitive touch...

Lesson 8 (Gravitation and Orbits) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this...

These short, simple life hacks are based on physics. Detangle your headphones, remove sticker residue, check if sunglasses are polarized, cool your car faster, and avoid getting static shock!

Bubbling air through sand can cause it to act like a liquid. Dianna Cowern and William Osman try to reproduce this popular GIF on Physics Girl. Sand liquefied!

I sit down with Zach Weinersmith from SMBC comics to ask him some physics trivia and logic riddles!

Inflation video with Alan Guth:

We made a pinhole camera in the back of a Uhaul! This pinhole camera is the best way to see an eclipse!

What happens when you keep building a skyscraper higher and higher? You may run into some problems with the laws physics. The higher you build, the faster the top of the building moves around the earth, and you end up with strong...

Why are there holes all over the southern California desert? This area is a unique basin that should actually be 20,000 ft below sea level. So I traveled there and spent 4 hrs looking for muddy holes in the ground.

What happens when you point the Hubble Space Telescope at the darkest part of the sky for 10 consecutive days? Besides using up extremely valuable time, what would you find?