An apple orchard’s fruitfulness literally results in a lot of fruit — the more fruitful it is, the more apples it produces. There are other, more figurative types of fruitfulness too. If your aunt and uncle have a huge family, with 12 kids, people might remark on their fruitfulness. And if a poet goes through a period of creating dozens and dozens of poems, that’s a kind of creative fruitfulness.

Interesting facts: There are more twins now than ever.
You might think twins are a rarity, but they’re actually becoming more common than ever. “From about 1915, when the statistical record begins, until 1980, about one in every 50 babies born was a twin, a rate of 2 percent,” writes Alexis C. Madrigal of The Atlantic “Then, the rate began to increase: by 1995, it was 2.5 percent. The rate surpassed 3 percent in 2001 and hit 3.3 percent in 2010. [That means] one out of every 30 babies born is a twin.”