Also, amateur science need not be at post grad level at all. It can be as simple and joyous as counting the different kinds of pollen on a piece of exposed sticky tape under a cheap microscope.
Or even just watching birds or trying to identify plants in a field of weeds. I'm an enthusiastic amateur scientist. I well remember the day when I used my bathtub to test the notion that water spirals out of it in different directions depending on the hemisphere you are in. Debunked that theory in ten minutes. :-)
I actually remain perplexed at how easily people believe things that they can very easily test without any expensive equipment...