Terence Tao is a supreme problem-solver whose spectacular work has had an impact across several mathematical areas. He combines sheer technical power, an other-worldly ingenuity for hitting upon new ideas, and a startlingly natural point of view that leaves other mathematicians wondering, " Why didn't anyone see that before?"
Answer: Life
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I am assuming that horses' is plural.
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If it were singular, it would be horse's.
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Sinces is it written s',it is plural.