The freshwater polyp Hydra oligactis is essentially immortal and reproduces asexually by cloning itself. Except when it gets too cold: then the animal switches to sexual reproduction, begins to age, ...

On a winter morning, when you are cozy in your futon, it is hard to get out."I don't want to do anything today... I want to ...

In the northern hemisphere, days are getting shorter and temperatures are dropping – autumn has arrived. A common sign that ...

Add Yahoo as a preferred source to see more of our stories on Google. Hydra vulgaris. Hydra, specifically Hydra vulgaris, are unassuming creatures. At their largest, the freshwater cnidarians ...