1. Fruit's Magic Gelatin (Pectin): Jam sets and thickens because of a natural starch found in fruit cell walls called pectin. When fruit is cooked with sugar and acid, pectin links together to turn runny fruit juice into a thick, spreadable gel.

2. Jam vs. Jelly vs. Marmalade: Jam contains crushed fruit pulp and seeds, while jelly is made from strained, clear fruit juice. Marmalade is a special kind of jam made strictly from citrus fruits like oranges, including pieces of the cooked peel!

3. A Royal Spanish Wedding Gift: In 1561, when Queen Mary of Scots fell ill with seasickness on a voyage, her doctor gave her orange marmalade. Legend says the word marmalade comes from the French phrase "Marie est malade" (Mary is sick)!

4. Sugar Is a Natural Guard: High amounts of sugar in jam do more than make it sweet—sugar draws water out of microscopic bacteria and mold cells, preserving the fruit so it doesn't spoil for months without refrigeration.

5. Astronauts Ate Jam on the Moon: During the Apollo 11 moon landing in 1969, astronauts Neil Armstrong and Buzz Aldrin had small packets of blackberry jam stored onboard the spacecraft as part of their breakfast rations.

6. Oldest Jam Recipe: The world's oldest known recipe for fruit preservation appears in Apicius, a Roman cookbook from the 1st century AD. Romans boiled soft fruits with honey or condensed grape juice to keep them fresh through winter.

7. The PB&J was born in WWII. American soldiers during World War II were supplied with peanut butter, jam, and pre-sliced bread. They began stacking them together for a quick energy boost, creating the famous sandwich we eat today!