Your intelligence varies from season to season if you are like most people. You are probably much sharper in the spring than you are at any other time of the year. A famous scientist, Ellsworth Huntington, concluded from other men’s work and his own among peoples in different climates that climate and temperature have a definite effect on our mental abilities.
He found that cool weather is much more favorable for creative thinking than summer heat. This does not mean that all people are less intelligent in the summer than they are during the rest of the year. It does mean, however, that the mental abilities of most people tend to
be lowest in the summer.
Spring appears to be the best period of the year for thinking. One reason may be that in the spring men’s mental abilities are affected by the same factors that bring about great changes in all nature.
Fall is the next-best season, then winter. As for summer, it seems to be good
A. records of changes in his own intelligence
B. work with people in different climates
C. records of temperature change
D. all of the above
What makes it rain Rain falls from clouds for the same reason anything falls to Earth. The Earth’s gravity pulls it. But every cloud is made of water droplets or ice crystals. Why doesn’t rain or snow fall constantly from all clouds The droplets or ice crystals in clouds are exceedingly small. The effect of gravity on them is minute. Air currents move and lift droplets so that the net downward displacement is zero, even though the droplets are in constant motion.
Droplets and ice crystals behave somewhat like dust in the air made visible in a shaft of sunlight. To the casual observer, dust seems to act in a totally random fashion, moving about chaotically without fixed direction. But in fact dust particles are much larger than water droplets and they finally fall. The average size of a cloud droplet is only 0. 0004 inch in diameter. It is so small that it would take sixteen hours to fall half a mile in perfectly still air, and it does not fall out of mo
A. The gathering of small clouds to form larger clouds.
B. The growth of droplets.
C. The effect of gravity on precipitation.
D. The movement of dust particles in the sunlight.
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