Three-quarter view of a young female in casual clothes putting hands in pocket while talking and gesticulating
Is the universe expanding or contracting?
Three-quarter view of a thoughtful middle-aged woman touching chin and looking aside
Three-quarter view of a teen girl in sportswear raising hand and reasoning
Front view of a teen girl in sportswear raising hands and reasoning
Three-quarter view of a teen girl in sportswear raising hands and reasoning
Front view of a serious female doctor raising head and touching chin
Man in his fifties with sceptical look
Didn't i tell you that it's cold outside?
Didn't i tell you that it's cold outside?
Didn't i tell you that it's cold outside?
Didn't i tell you that it's cold outside?
Three-quarter view of a thoughtful gesticulating young asian female in breeches and blouse
Three-quarter view of a young gesticulating dark-skinned man in yellow t-shirt explaining something
Three-quarters view of a kid boy in casual clothes looking surprisingly