Evolutionary biologist explains why 90% of humans are right-handed

11 articles · Updated · Forbes · Apr 25

Research shows that about 90% of people globally are right-handed, a pattern seen across all cultures and dating back at least 2.6 million years.
The biologist outlines four main hypotheses for this bias: tool use, communicative gestures, hierarchical action planning, and social motor learning, suggesting these factors collectively shaped human handedness.
Left-handedness remains stable at about 10% due to evolutionary advantages in rarity, while true ambidexterity is extremely rare and linked to weaker brain lateralization, sometimes associated with academic or attention challenges.

Why has evolution preserved a left-handed minority for millions of years?

Did making stone tools millions of years ago determine which hand you use today?

Could your dominant hand reveal how your brain is uniquely wired for language?

What damage occurs when a left-handed child is forced to be right-handed?

Why is true ambidexterity so rare and often linked to learning difficulties?