How many activities tie in together astronomy, physics, chemistry, electronics and information technology among other topics into a single wrapper? Ham Radio sure does. Wanna contact the International Space Station on a handheld? Want to bounce a signal off the moon or meteor trails to contact somebody? Want to use a satellite to contact other hams? Want to bounce a radio signal off the northern lights to initiate a contact? Want to be able to call rescue in spot where you have no signal on your handphone? Want to still be able to communicate intra-country and overseas when the phone and electricity grids both go down? Want to volunteer to provide communication services in case of an emergency? The list goes on and on, but I am sure you are starting to get the picture.