OK, I know this is silly in the scheme and scale of beekeeping, but it was a surprise and it felt good! Some bees were flying in sub-50 temps till the sun went in, when I found some who didn't make it back in time, seemingly dead (curled up, legs crossed, no movement) on the snow and the entrance. Just for the heck of it I picked one up and blew on it in my cupped hand; after about 15 seconds I saw one antennae quiver, followed soon after (with more breathing on it) by some tremors in the back legs, followed quickly by full leg movement and standing up! Within another 15 seconds, the abdomen was pulsing and the bee was walking around, and walked back into the upper entrance when I placed my hand there. So far I am 5 for 5 - progression in all cases exactly the same. I know that the numbers are meaningless, but with nothing else at this time of year that you can do to help your bees, it felt like something ;)