lionhead

Answer: It's a corn snake.

lionhead

Chosen answer: Out of everyone's apartments, the gang likely eats and hangs out at Leonard and Sheldon's apartment because it has the largest living room space and they would be given the most amount of room to interact in. Raj's apartment and Penny's apartment do not appear to have as much living room space as Leonard and Sheldon's apartment, so they may not want to hang out there, nor would they want to hang out at Howard's place since his mother would be there.

Casual Person

In addition to this, I'm sure that Sheldon has some sort of rule that if they aren't eating at a restaurant, they eat at Sheldon and Leonard's place because it's where Sheldon is most comfortable.

immortal eskimo

In addition, I think a big part of the reason would be that 3 of the 5 (at first) friends lived in the same building so eating there meant fewer people had to travel. Plus, it was very quickly traditional for Penny to come over to Leonard and Sheldon's apartment to eat so it was natural it stayed that way. And lastly, it's not at Penny's apartment since Penny usually doesn't have money to pay for the food so since Leonard usually brings the food, it's logical everyone goes to his apartment.

lionhead

This isn't true. In one episode, I can't remember which, the group eats at Raj's place with Priya. Sheldon expresses his displeasure to Amy who explains that Leonard is the nucleus and that where Leonard goes, everyone goes. Sheldon has no such rule about eating there.

Ssiscool

Since he states his displeasure it proves he is more comfortable eating at home. He even doesn't like eating at a dinner table in his own apartment, let alone somewhere else entirely. He only compromises if he has no choice.

lionhead

Answer: Because she is not the mother-type. She is a very emotionally detached person. She probably got children for the prospect of them being successful and interesting to her work. Not because she likes raising them or take care of them.

lionhead

Answer: Sheldon is extremely bad at keeping a secret. He actually doesn't want to keep a secret and tries to find or create a justification to tell it so the pressure will be off him.

lionhead

Answer: He has no concept of money and simply cannot budget at all. Therefore it is likely he squandered his money.

Ssiscool

Answer: Scientists actually hardly make any money. Raj is almost fully supported by his parents to live like he lives.

lionhead