#2568: Spinthariscope explain

[Cueball is holding a small item up in on hand in front of his three friends. Megan has her arms lifted and bent in front of her, White Hat has his arms raised over his head and Ponytail is pointing at Cueball while her other hand, held down behind her, is balled into a fist.]

Cueball: It’s a spinthariscope, a 1940s toy with a radioactive isotope inside. If you let your eyes adjust to total darkness and look into the lens, you can see the flashes of individual atoms decaying.

Megan: What??

White Hat: Aaaaa!

Ponytail: Get it away!

[Caption below the panel:]

Fun fact: Spinthariscopes have the highest ratio of “that can’t possibly be safe and legal” to actual safety and legality of any known toy.