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Penicillin was the first antibiotic
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As a result, fertility rates declined
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The first successful heart transplant was performed by South African Christiaan Barnard. Robert Jarvik led a team that made an artificial heart.
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Ebola is a deadly virus that was discovered in the Congo in 1976. The disease causes extensive bleeding to the point of death.
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HIV weakens the immune system and causes AIDS. By the Mid-1990s, Antiretroviral drugs that could stop HIV from weakening the immune system were developed.
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A peaceful demonstration leads to soldiers killing protesters
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First major international agreement to reduce carbon emissions.
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195 countries signed, but Donald Trump withdrew the US in 2017
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