 A man who died in a lawnmower accident near Jessup on Thursday has been identified as a teacher at Don Bosco High School. Authorities say Jake Knepper was loading a commercial-grade lawnmower onto a trailer when the mower tipped over on top of him, killing him. This is Radio Iowa. So why do I need vaccinations? If I don't get vaccinated, how sick could I get? Can I get multiple vaccines at once? What's done to make sure vaccines are safe?