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
Thoughtful teen girl
Side view of a teen girl in sportswear explaining something while raising hands
Side view of a teen girl in sportswear explaining something while raising hands
Front view of a thoughtful gesticulating young dark-skinned man in yellow t-shirt
Three-quarter view of a thoughtful gesticulating young dark-skinned man in yellow t-shirt
Doubtful teen girl touching her chin
Is the universe expanding or contracting?
Does this law work this way?
Three-quarter view of a young gesticulating dark-skinned man in yellow t-shirt explaining something
Pensive teen girl in sportswear
Three-quarter view of a thoughtful young dark-skinned man in yellow t-shirt raising hand
Side view of a female doctor looking aside and touching chin
Doubtful teen girl in sportswear
Three-quarter view of a thoughtful old man raising hand and looking aside
Front view of an old smiling man gesticulating with his eyes closed
Three-quarter back view of a young gesticulating dark-skinned man in yellow t-shirt explaining something
Pensive teen girl
Side view of a thoughtful gesticulating young dark-skinned man in yellow t-shirt
Side view of a young female looking thoughtfully at golden greek sculpture
Front view of a young female looking thoughtfully aside while standing by golden greek sculpture
Front view of a young female looking thoughtfully aside while standing by golden greek sculpture
Three-quarter view of a young female in casual clothes putting hands in pocket and greeting
Three-quarter view of a female doctor touching lips and looking aside
Three-quarter view of a thoughtful old lady in office clothing
Front view of a female doctor biting lips and touching chin
Three-quarter view of a young female looking thoughtfully aside while standing by golden greek sculpture
Three-quarter view of a gesticulating young man in red pullover
Three-quarter view of thoughtful old man touching chin
Side view of a grimacing businesswoman in a black suit
Front view of thoughtful old man touching chin
Front view of a curious female doctor biting lips and looking aside
Front view of a thoughtful kid boy touching chin and looking aside
Side view of a smiling businesswoman in a black suit
Side view of a curious old lady in office clothing leaning forward
Front view of a young female doctor looking at her notes
Front view of a young female looking at camera and pointing straight her pen
Front view of a surprised female doctor looking aside and touching chin
Front view of a female doctor smiling and touching chin
Side view of a pouting young man in casual clothes holding hands together
Three-quarter back view of a thoughtful young man touching his nose
Side view of an old man talking and gesticulating
Front view of thoughtful old man touching chin
Three-quarter view of thoughtful old man touching chin
Front view of an old ruse man gesticulating and looking at camera
Side view of a teen girl in sportswear raising hands
Back view of a teen girl in sportswear raising hands
"well, i don't know"
Back view of a teen girl in sportswear balancing on her leg raising her hand while questioning
Front view of a perplexed female doctor holding a pen with a tablet and looking at camera
Three-quarter view of a young female looking thoughtfully at camera while standing by golden greek sculpture
Front view of a teen girl in sportswear looking at her hand
Front view of a young female looking down and taking notes
Three-quarters view of a kid boy in casual clothes looking surprisingly
Front view of a serious female doctor raising head and touching chin
Three-quarter view of a thoughtful gesticulating young asian female in breeches and blouse
Three-quarter view of a pouting young man in casual clothes holding hands together
Three-quarter back view of a teen girl in sportswear raising hands