Guess people didn't like yesterday's multiple choice. For those interested, the answers are: 1) Sucralose (Splenda), 2) Aspartame (Nutrasweet) and 3) Saccharin (Sweet & Low)
The head of a pin at 200x. You can see the reflection of my finger in the metal.
A piece of steel cut oatmeal which apparently took a small sliver of the steel along for the ride. 60x.
Baking powder at 200x
An undeveloped grape still on the stem at 60x
What is today's 60x mystery image? Guesses in the comments.