Good Riddles

 
Riddle #526 (medium)

Question: What grows up and down at the same time?

Riddle #4 (medium)

Question: What starts with the letter "t", is filled with "t" and ends in "t"?

Question: Fast you travel, but I travel faster. The faster you travel, the further away I get still. Close as you may get, the faster I still will be. What am I?

Question: 7 months have 31 days. How many months have 28 days?

Question: I'm measured in temperature and time, but have neither.

What am I?