1. Scale of things, from the Plank length all the way to the observable universe. XKCD version here for big and here for small.
2. What would Deep Space 9 be like with modern technology?
3. #FedValentines. More here.
4. Autism Spectrum Quotient test. I got a 27. Average is around 15 for women, 17 for men, 23-25 for mathematicians/scientists.
5. Lectures are ineffective.