We found four white eggs the size of ping pong balls, in shallow water by our dock. We are in east central Minnesota. What animal would lay such an egg?  Cindy

In my small backyard pond in southern Ontario, there are bright orange-red water bugs.  Some are 1 mm.  Eyes are visible but no legs, yet.  There are millions of these free swimmers/floaters. Will I and my neighbors be inundated with biting insects or are they beneficial?  Judy

There’s a little body of water near my building in New York where, a couple months ago, my kids an I found a few hundred tadpoles. The water was bright blue and beautiful and the tadpoles, big, and always swimming around full of life. Over time, the water has gone more gray, and the tadpoles move around a lot less, some don’t seem move at all. Are they hurt? Can I help them?  Jenna