Manfred Tetz gives tips on what you can do for good vision.
Manfred Tetz explains how defective vision can be corrected with surgery.
Important topics in a nutshell. Thirty-eight tips for understanding Germany and the Germans.
So Stephen Hawking says we'll need to get off-planet within 100 years. He may be right, or not. We may live on Mars or the moon, or not. Either way, space is physically tough on humans. Will we biologically evolve?
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