QUESTION: Fix punctuation: One consolation however may be the socalled twin paradox which means that if you travel at the speed of light time stands still Relativity theory suggests however that if you travel faster than light then travels back in time
ANS: One consolation however, may be the so-called twin paradox, which means that if you travel at the speed of light, time stands still. Relativity theory suggests, however, that if you travel faster than light then travels back in time.

QUESTION: Fix punctuation: The default value is 125 seconds
ANS: The default value is 125 seconds.

QUESTION: Fix punctuation: BOST55 Rent subsidy paid to new early retirement pensioners by unit
ANS: BOST55: Rent subsidy paid to new early retirement pensioners by unit

QUESTION: Fix punctuation: Uri Golman specializes in the Arctic and won awards for his nature photography and visited Greenland on numerous trips
ANS:
Uri Golman specializes in the Arctic, and won awards for his nature photography and visited Greenland on numerous trips.