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But dinosaurs didnât appear until about 230 million years ago. Mammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years.And recorded civilization has lasted only about 5,000 years.ammals first appeared around that same time. The first human-like animal, or hominid, dates to about 4.5 million years ago, but modern humans only date back perhaps 60,000 years. And recorded civilization has lasted only about 5,000 years.
By December 1958, the Americans had sent a living creature into space and in May 1959 monkeys Able and Baker became the first animals to survive the trip. Yet these early American achievements were eclipsed on April 12, 1961 when the Soviet Union put the first human, Yuri Gagarin, into space.