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Asexual reproduction can produce twice as many offspring as sexual reproduction without the hassle of finding and courting a mate. So why do most complex animals have two sexes? Why not three?
insights puzzle

Why Are There Two Sexes?

Asexual reproduction can produce twice as many offspring as sexual reproduction without the hassle of finding and courting a mate. So why do most complex animals have two sexes? Why not three?

Like scientific puzzles, Bongard problems can lead you through a frustrating blind search until you find that simple, elegant rule that fits a seemingly random pattern.
insights puzzle

Solution: ‘Bongard Problems and Scientific Discovery’

Like scientific puzzles, Bongard problems can lead you through a frustrating blind search until you find that simple, elegant rule that fits a seemingly random pattern.

For your frustration, joy and entertainment, our puzzle challenges you to find general patterns or rules based on seemingly random, specific examples.
insights puzzle

Bongard Problems and Scientific Discovery

For your frustration, joy and entertainment, our puzzle challenges you to find general patterns or rules based on seemingly random, specific examples.

How Darwinian natural selection can produce and sustain a Lamarckian “inheritance of acquired characteristics.”
insights puzzle

Solution: ‘Darwinian Evolution Explains Lamarckism’

How Darwinian natural selection can produce and sustain a Lamarckian “inheritance of acquired characteristics.”

Answering three questions can help reveal how the “inheritance of acquired characteristics” fits into modern evolutionary theory.
insights puzzle

Can Darwinian Evolution Explain Lamarckism?

Answering three questions can help reveal how the “inheritance of acquired characteristics” fits into modern evolutionary theory.

There’s more than one good way to bring order to our unruly, seemingly arbitrary calendar.
insights puzzle

Solution: ‘Friday the 13th’

There’s more than one good way to bring order to our unruly, seemingly arbitrary calendar.

How our society defines years, months and weeks can seem frustratingly arbitrary. Can you bring order to our unruly calendar?
insights puzzle

Is It Friday the 13th Again?

How our society defines years, months and weeks can seem frustratingly arbitrary. Can you bring order to our unruly calendar?

How to calculate when a gene’s rate of evolution will slow to a crawl.
insights puzzle

Solution: ‘A Ticking Evolutionary Clock’

How to calculate when a gene’s rate of evolution will slow to a crawl.

How quickly will a gene’s rate of evolution slow to a crawl?
insights puzzle

A Ticking Evolutionary Clock

How quickly will a gene’s rate of evolution slow to a crawl?