A long time ago, in a galaxy far far away… we wondered, could you ever build a real lightsaber like the ones in Star Wars? A lightsaber is a glowing sword that can cut through metal – and pretty much anything else you can think of. It’s the favorite tool of heroes like Luke Skywalker and Ahsoka Tano, as well as villains like Darth Vader. That’s just in the movies, but could we make them real? We asked mechanical engineering professor Sayan Biswas to help us find the answer.

Got more questions than Luke when he was training with Yoda? Send them to us at BrainsOn.org/contact, and we’ll help use the force to find an answer!

All different kinds of giant prehistoric creatures used to walk the Earth, from 20-foot-tall sloths to sharks longer than a school bus.. They all seem huge in our imaginations, but were animals in the past actually bigger than animals on Earth now? We asked paleontologist Kristi Curry Rogers to help us find the answer.

Got a BIG question? Send it to us at BrainsOn.org/contact, and we’ll help size up the answer!

If there’s one thing that’s generally known about sharks, it’s that they have sharp teeth. But have you heard they have to keep moving to stay alive? Why is that? In this episode we talk to shark scientist Melissa Cristina Marquez about this very question.

Do you have a Moment of Um question that seems kind of fishy? Send it to us at BrainsOn.org/contact, and we’ll chew on the answer.

When our skin gets irritated, it reacts! And sometimes a rash appears. Rashes can be red, itchy, painful and bumpy… But how does our skin make them? We asked pediatrician Dr. Anjuli Gansto help us find the answer.

Got a question under your skin? Send it to us at BrainsOn.org/contact, and we’ll rash to find the answer!

Radios are like magical devices. You just flip a switch and BAM, you can listen to everything from punk rock to world news. But how exactly does a radio work? And what’s the difference between AM and FM radio? We asked physics expert Angie Huerta to help us find the answer.

Got a question that’s AM-azing? Send it to us at BrainsOn.org/contact, and we’ll dial in the answer.

If you’ve ever banged your knee pretty badly, you might have noticed the knee swells up to larger than its normal size. To ease your pain and make the swelling go down, maybe someone handed you an ice pack. But why is it ice that does the trick to reduce swelling, and does anything else work? We asked physical therapist Karen Litzy to help us find the answer.

Got a Moment of Um question that’s making your brain swell? Send it to us at BrainsOn.org/contact, and we’ll help get it all sorted out.

Lots of people love spicy food for that tongue-tingling feeling. But where does it come from? What’s happening in our mouths when we bite down on a jalapeño or chili flake? We asked taste and smell researcher Arthur Zimmerman to help us find the answer.

Got a tasteful question? Send it to us at BrainsOn.org/contact, and we’ll spice up your life with the answer!

Earth is always moving around the sun, but does the sun move too? Or is it fixed in one place in the cosmos? In this episode, we talk to astrophysicist Brittany Kamai to get to the heart of this issue!

Do you have a Moment of Um question that’s burning in your brain? Send it to us at BrainsOn.org/contact, and we’ll help shine a light on the answer.