Problem: Two teams of meteorologists studied environmental changes in Antarctica. Team A studied East Antarctica, while team B studied West Antarctica. They published their findings in a peer reviewed publication. Which team didn't observe appreciable melting at the surface?

A: team B

Problem: In the ant world a war has been waged. Two rival groups of Acromyrmex heyeri ants, group A and group B, are battling each other to gain territory. The goal is to attack the rival group when they have more openings in their nest thatch. In battle day one group A territory had 5 C temperature. In battle day two group A territory had 22 C temperature. In battle day three group A territory had low air humidity. In battle day four group A territory had high air humidity. In battle day four would group A have less openings or more openings in their nest thatch?

A: more openings

Problem: Mike and John are brothers. Their dad sent them to the doctor's office to get tested for hepatitis because Mike was feeling sick all the time. It turned out Mike has hepatitis B, while John doesn't. Which brother didn't have a disease of the liver?

A: John

Problem: Stargazers across the world wait for 2020 when newly discovered very bright Neil's comet would start to pass through the inner solar system On December 21, 2020. After December 27, 2020 the comet would leave the inner solar system. Like many other enthusiasts Ken bought a telescope for the event. His friend Mike is interested in that event too, but is too busy to buy a telescope. On which date Neil's Comet would not be visible, December 21, 2020 or December 27, 2020?

A:
December 27, 2020