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Answer:
• What it is: An antibiotic discovered by Alexander Fleming in 1928.
What would happen if it wasn't discovered: Millions of people would die each year from infections that are now easily treatable with penicillin. Simple things like a cut or a skin infection could become life-threatening. Many medical procedures, like surgery, would be much riskier.
• What it is: A fundamental force of nature that can be harnessed to power our world.
What would happen if it wasn't discovered: We would live in a world without lights, computers, phones, cars, or most modern appliances. Our lives would be much more difficult and less efficient.
• What it is: A machine invented by Johannes Gutenberg in the 15th century that allowed for the mass production of printed materials.
• What would happen if it wasn't discovered: The spread of knowledge and literacy would be much slower. Books would be extremely expensive and rare, only available to the wealthy. The Renaissance and the Enlightenment might have been delayed or even prevented.
[Drawings of Penicillin, a Lightbulb, and a Printing Press in boxes]