This KS1 maths article shows how to compare the mass of objects using non-standard measures.

New Caledonian Crows Estimate an Object's Weight in an Ingenious Way This skill "appears to be very intuitive to these birds." by Peter Hess ...

Learn how to compare mass in grams and kilograms with this KS2 Year 3 Maths guide.

Researchers found that body parts like hands defy the size-weight illusion that applies to objects. In a study, participants perceived larger hands as heavier and smaller hands as lighter, contrary to ...