41.   If water flows, pour in half a cup of straight liquid bleach.

42.   In one segment, kids get to help put together a fire hose so the water can flow from the hydrant to the burning house.

43.   In Supai, the blue-green water flows in the same direction, tumbling down the breathtaking falls.

44.   In the open sea, upwellings would form more easily in the region of the bubbles, while the water would flow downwards again a short distance away.

45.   In reverse osmosis, the sap is forced under high pressure through tubes lined with a special membrane that allows water to flow through but blocks molecules of sugar.

46.   Indeed, as the water flowed, Christianity began to take root.

47.   Instead of maintaining a preset temperature by switching on and off throughout the day, however, a tankless hot water heater produces heat only when water is flowing.

48.   Its design allows water to flow into the gutter, and keep out leaves, needles, and other debris.

49.   It should also slope downward at each end so that water can flow out of the ends easily.

50.   Look for low spots in the gutter and indications that water is not flowing smoothly.