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Math puzzle: The four islands
Solve the math puzzle from our October 2025 issue, in which four princesses divide up lands to keep peace.
- Health & Medicine
A handheld ‘bone printer’ shows promise in animal tests
Demonstrated in rabbits, the 3-D printer might someday print bone grafts directly onto fractures, complete with antibiotics to ease healing.
- Animals
Tug or fetch? Some dogs sort toys by how they are used
Dogs that easily learn the names of toys might also mentally sort them by function, a new example of complex cognitive activity in the canine brain.
- Health & Medicine
Why are so many young people getting cancer?
Diagnoses for several cancers before age 50 have been increasing rapidly since the 1990s.
