Reset Button. Most boilers have safety devices built in, so if these are tripped a simple reset may get your whole system working. The reset button is normally on the front of the boiler. Sometimes it's a dial that needs resetting to zero and turned back on.
A typical diffusion constant for a medium-sized molecule in water is about . If we want the smell to travel a quarter mile, or a little less than , we get a speed of. This speed is fantastically slow, and says that it would take ten million years for blood to diffuse out to a shark a quarter mile away.
Researchers know, for example, that sharks can smell blood and that they can sense electrical pulses in the water, such as the flailing of a toddler in the surf. I think it could smell blood and thought I was dead. The French and the Germans--so often the voices of stagnant conservatism in the EU--seem to smell blood.