My little chicken helper and I candled the eggs we set back on the 8th. All 4 of the SFH test eggs are developing and we could see the embryos wriggling around inside. I was surprised at how much detail we could see inside because I'm used to trying to peer through dark brown or blue shells. I was able to point out to my daughter how big the head was relative to the body and she could tell that the largest dark spot was the eye. We use an LED spotlight and funnel to candle the eggs. It works well because the LED doesn't heat up no matter how many eggs I need to candle.