There are two things you can always count on: public radio pledge drives and the local blood bank asking for a donation of a very different sort.
Both kinds of giving can fill you with a sense of goodwill. But, let's be honest, the tote bags help, too.
When it comes to blood donations, though, ethical concerns and risk have led to limits on incentives for donors in many places. The World Health Organization has set a goal for governments around the world to reach completely voluntary and nonremunerated donations of blood by 2020.
The Ring Nebula, whose iconic shape and large size make it a favorite of amateur astronomers, can now be seen in new detail, after NASA's Hubble Space Telescope captured a sharp image of the nebula. Researchers say the new clarity reveals details that were previously unseen, and a structure that's more complex than scientists had believed.