Usually, the only outcome of intensively exercising a very naughty dog is an even fitter naughty dog. We’ll look a bit more at control issues in a moment. But you may be interested to know that dogs don’t need to be exhausted or even tired to be trainable. On the contrary, I trai...
Macrophages can practically "sniff out" intruders: Theircell surfacecontains numerous sensors—the Toll-like receptors. These work in a similar way to the olfactory receptors in the nose: They are activated when they encounter a specific chemical signal. The alarm they trigger then leads to a ser...