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Reactions is a show that uncovers the chemistry all around us. We answer the burning questions you’ve always wanted to ask, blending the worlds of science and every-day life.

Watch • 11:57
Reactions
I Made Kidney Stones So I Could Destroy Them Forever
Alex made some kidney stones at home and tested prevention methods to keep them at bay.
Episode: S10 E15 | 11:57
Watch • 10:38
Reactions
How Trees Pollute the Air (and Why Your Coworker's Scientific Citations Don't Mean They're Right)
An email from a subscriber made us question everything we thought we knew about trees.
Episode: S10 E14 | 10:38
Watch • 12:07
Reactions
Why is the US buying Canada's trash for $30,000 per gram?
This element powers glow in the dark exit signs, keychains, and costs $30,000 per gram.
Episode: S10 E12 | 12:07
Watch • 9:19
Eons
The Dinosaurs That Evolution Forgot
Where are all the east coast dinosaurs?
Episode: S7 E7 | 9:19
Watch • 53:25
Austin City Limits
Wynonna
Country Music Hall of Fame icon Wynonna celebrates her 40-year career in a moving hour.
Episode: S50 E5007 | 53:25
Watch • 15:14
PBS Space Time
What If the Cosmological Constant Is Not Constant?
Is Dark Energy Getting Weaker?
Episode: S10 E23 | 15:14
Watch • 16:08
PBS Space Time
What If The Universe Did Not Start With The Big Bang?
Here’s the story we like to tell about the beginning of the universe.
Episode: S10 E22 | 16:08
Watch • 10:50
Eons
Where Did the Moon Come From?
Where did our moon come from? The origin is even stranger than you may imagine.
Episode: S7 E5 | 10:50
Watch • 17:44
PBS Space Time
The New Physics of Black Hole Star Capture | Extreme Tidal Disruption Events
We’ve never seen a TDE in the Milky Way, but we’ve seen them in distant galaxies.
Episode: S10 E21 | 17:44