I'm still amazed that people are going deep into their hives, checking the brood, queens, generally messing around. It can be so easy to mess up at this time of year, as hive temperatures can be so important. A drop in outside temperature....like about to happen....coupled with making a colony split up across the frames etc. due to 'fiddling.' can cause the bees to fail in keeping the colony warm enough.
Next set of posts:
'It's Spring, yet my bees are dead. They were fine when I looked at the brood frames a few weeks ago!'
'Is my queen dead? I only saw her in late February.'