Open Questions

Food Allergies

Why have food allergies increased by a factor of 80 since 1940? This seems to be a worldwide phenomenon. Despite different governments, cultures, diets, and hobbies, we all seem to be getting more allergic.

Neutron Lifetime Puzzle

What is the half life of free neutrons? One experiment yields a mean lifetime of 14 minutes and 39 seconds. Another experiment yields 14 minutes and 48 seconds. The error margins for these experiments do not overlap.