You might want to know how cold it is. You may need to know how fast the wind is blowing. Maybe it rained last night? Do you know how much? Does it feel humid to you? You have heard all these questions before. To answer these questions, we need data. That data comes from special tools. These tools collect data about the weather. You can see some of the common tools listed below: A thermometer measures temperature. An anemometer measures wind speed. A rain gauge measures the amount of rain. A hygrometer measures humidity. A wind vane shows wind direction. A snow gauge measures the amount of snow.

What do "special tools" do with data?

Halting just outside the village, Harry formed his men with a front across the whole road, and directed the lines to advance, twenty yards apart. Then, placing himself at their head, he gave the word, and charged down the street upon the Roundheads. The latter, occupied by their attack upon the houses, were unconscious of the presence of their foe until he was close upon them, and were taken utterly by surprise. The force of the charge was irresistible, and the Roundheads, dispersed and on foot, were cut down in all directions. Groups of twos and threes stood together and attempted resistance, but the main body thought only of regaining their horses. In three minutes after the Royalists entered the village the surviving Roundheads were in full flight, hotly pursued by the victorious Cavaliers. These, being for the most part better mounted, overtook and slew many of the Roundheads, and not more than half the force which had set out returned to their quarters at Didcot. The pursuit continued to within half a mile of that place, and then Harry, knowing that there was a force of Roundhead infantry there, drew off from the pursuit, and returned to Chalcombe. He found that more than half of Sir Ralph Willoughy's men had been killed, many having been cut down before they could betake themselves to their arms, those quartered in the inn, and at two or three of the larger houses, having alone maintained a successful resistance until the arrival of succor.

Who was surprised to learn that more than half of Sir Ralph Willoughy's men had been killed?

When you get sick, your body springs to action. Your body starts to fight the illness. Thats why you want to eat right and get plenty of sleep. You need a strong immune system to fight off illness. Plants dont have an immune system. That does not mean they do not get sick. Plants are affected by disease just like us. Typically, their first line of defense is the death of part of the plant. This prevents the infection from spreading. Many plants also produce special chemicals to fight disease. For example, willow trees produce a chemical to kill the bacteria. The same compound is used in many acne products. You can see a picture of a willow tree in Figure Plants may be smarter than we think. No, they cannot talk to each other. They may be able to send messages, though.
What do humans have that plants don't have?