How do you explain suicidal crickets and zombie caterpillars? One word: parasites. Science writer Ed Yong shows us how these tiny creatures force insects and animals to do their bidding, and asks: Are parasites manipulating humans, too?

We want to know what you think. Join the discussion by posting a comment below or tweeting #TEDWeekends. Interested in blogging for a future edition of TED Weekends? Email us at tedweekends@huffingtonpost.com.