If you wish to comment or ask a scientist a question, you need to register; or you can login with Facebook below.
Username:
Password: Log In
Lost your password?
You need to be logged in to see this profile
why is ozone layer important
why is it possible to call person in far place
why it only earth that support life but not any other planet
who is the best scientuist in the world
how can i become a better scientist
My Comments