Question: Two friends had unprotected sex with their respective dates on the same night. Everything went fine for both of them. They later found out the bad news. Mike had been infected with HIV. Luckily enough Pete was healthy, he didn't get any diseases. Which friend had a virus that is transmitted by contact with infected semen?
Answer: Mike

Question: Two friends were into natural sciences. Tom was more into Geology, while Rick studied Ecology. Which student read less about the flow of energy?
Answer: Tom

Question: Year 2022 would be an interesting year when three comets would get scientists' attention - Comet A, Comet B, and Comet C. Comet A and C are very faint, but Comet B is very bright. Comet A would enter the inner solar system on February 10, 2022 and leave the inner solar system on February 20, 2022. Comet B would enter the inner solar system on February 18, 2022 and leave the inner solar system on February 26, 2022. Comet C would never enter the inner solar system. Which comet's dust would never reflect sunlight, Comet B or Comet C?
Answer:
Comet C