After lunch today, we climbed the 120 ft. tall tower that the research center uses to measure radiation from the sun. I took a long time to climb because I stopped every few steps to listen to the sound of the metal stairs and railings vibrating. On the platform at the top of the tower there are many scientific instruments and some of them move automatically as the sun crosses the sky so they can track its light. Light is made of different wavelengths or bands. The most harmful (and the one scientists here are most interested in studying) are the ultra-violet bands (UV-Bs). Much of the platform is covered with sharp wire to keep the birds from landing there and damaging the equipment. The view is amazing...miles of treetops, the SERC laboratories below, and the Bay in the distance!