In many parts of the world today it will be possible to view the transit of the planet Venus passing in front of the sun. This rare event will not occur again for more than 100 years. However, long, direct exposure to the sun's light can cause permanent damage to the retina. Here is a link to Sky and Telescope for tips on safe viewing. The safest way is probably online via your computer!
PositiveTip: Inform youself about safe methods of viewing the sun--before needlesly suffing eye damage.