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Puzzle solvers used “imaginary” numbers to solve a real world problem: finding long-lost treasure.

In spite of their name, “imaginary” numbers are as real as any other numbers, especially when it comes to hunting for lost treasure.

Celebrate a year’s worth of scientific and mathematical insights by solving this brain-teasing cryptic crossword from our puzzle columnist.

Tadashi Tokieda discovers new physical phenomena by looking at the everyday world with the eyes of a child.

Puzzle solvers explored how evolution may have used negative and positive control mechanisms to shape the conflicting parental functions of reproduction and child rearing.

Two dynamic, seemingly opposing forces likely played an important role in the evolution of reproduction and child rearing in social animals like bees and humans.

How much stock should we put in mathematical models of evolution that have not been validated by rigorous empirical data?

Evolutionary stories like the grandmother hypothesis are easy to construct from mathematical models, but how well do they reflect reality?

The all-too-intuitive picture of a straight arrow going from cause to effect is far too simplistic to describe the real world.