牛津大学的最新研究成果表明，经过数百万年的漫长进化，如今的狗类较之猫类拥有更大的脑。这是因为与独居动物相比，高度群居类的哺乳动物需要运用更多的脑力。
Over millions of years dogs have developed bigger brains than cats because highly social species of mammals need more brain power than solitary animals, according to a study by Oxford University.
退休后什么也不做的人会失去脑质量，反之，那些保持活跃脑力兴趣的人能保持脑质量，甚至增加脑质量。
Humans who retire to do nothing lose their brain mass, whereas those who keep active mental interests maintain mass and even increase it.
如果不睡觉的话，脑力会达到饱和，这会影响到脑内正常的能量预算、供给储备以及进一步学习的能力。
Without sleep, the brain reaches a saturation point that taxes its energy budget, its store of supplies and its ability to learn further.
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