It's essentially a neat and tidy kit of blocks, shapes, wheels, and other pieces — all non-toxic – that in total creates 20 different challenges for kids, each one more advanced than the next.

Crows can count... out loud! They do so similarly to human toddlers who are learning to tally things up. A neuroscientist trained birds to produce a number of calls in response to random visual cues.

Magnetic blocks. Toddlers love Magna-Tiles. They’re also expensive and easily break underneath an adult’s foot, causing the little magnets inside the plastic housing to pose a choking hazard.