Parasitic wasps dive-bomb ants, injecting their eggs into ant bodies. Soon the ant dies, its body converted into an egg-producing factory.
Four wasp species...
Parasitic wasps dive-bomb ants, injecting their eggs into ant bodies. Soon the ant dies, its body converted into an egg-producing factory.
Four wasp species...
Suivant la mode et l’engouement suscités par les app stores, le géant de la communication via Internet Skype vient d’ouvrir le sien mercredi dernier : le Skype App Directory. Celui-ci n’est pour l’instant disponible qu’en anglais, et n’offre qu’un choix restreint d’applications tierces (23 à ce jour).
Des applications externes pour Skype avaient déjà été développées auparavant, mais la mise en place d’un tel site par la société constitue leur premier effort pour permettre à leurs utilisateurs de rechercher et télécharger les logiciels qui les intéressent, donnant une allure plus “offi...
Twitter person David Cox (@dcox21) asks:
Read a random fact yesterday that said the “average rain drop falls at 17mph.” Is that reasonable?
Let the physics begin. You might think: hey, wont’ the speed depend on how high the water started? Well, it would if air resistance on the water drop were not important. However, I suspect that the rain will fall at terminal velocity. Terminal velocity is the case when the air resistance on the object is equal to the gravitational force on the object. When this happens, the net force is zero (the zero vector) and the object falls at a...