Three-quarter view of a young female in casual clothes putting hands in pocket while talking and gesticulating
Is the universe expanding or contracting?
Side view of a pouting young man in casual clothes holding hands together
Front view of a bossy young man dressed in red pullover and holding hands together
Side view of a bossy young man dressed in red pullover and holding hands together
Three-quarter back view of a thoughtful young man touching his nose
Front view of an old perplexed man in yellow pullover gesticulating actively and looking at camera
Three-quarter view of a thoughtful old man raising hand and looking aside
Front view of thoughtful old man touching chin
Front view of a teen girl in sportswear raising hands and arguing
Front view of an old ruse man gesticulating and looking at camera
Front view of a thoughtful kid boy touching chin and looking aside
Thoughtful teen girl
Side view of a teen girl in sportswear raising hand and arguing
Side view of a teen girl in sportswear raising hand and arguing
Three-quarter view of a thoughtful gesticulating young dark-skinned man in yellow t-shirt
Front view of a teen girl in sportswear raising hands and arguing
Back view of a teen girl in sportswear raising hands
Three-quarter view of a thoughtful businesswoman in a black suit biting lips and looking aside
"well, i don't know"
Three-quarter view of a thoughtful old lady in office clothing
Side view of a teen girl in sportswear raising hand and arguing
Front view of a thoughtful gesticulating young dark-skinned man in yellow t-shirt
Side view of a thoughtful teen girl in sportswear biting her finger
Side view of a smiling businesswoman in a black suit
Back view of a teen girl in sportswear balancing on her leg raising her hand while questioning
Side view of a teen girl in sportswear raising hand and arguing
Doubtful teen girl touching her chin
Three-quarter view of a teen girl in sportswear raising hand and arguing
Three-quarter back view of a teen girl in sportswear raising hand and arguing
Side view of a teen girl in sportswear looking at her hand
Three-quarter view of a thoughtful teen girl in sportswear biting her finger
Three-quarter view of a thoughtful businesswoman stepping aside and biting lips
Front view of a thoughtful teen girl in sportswear biting her finger
Side view of a teen girl in sportswear raising hand and arguing
Front view of a gesticulating female doctor looking aside
Side view of a teen girl in sportswear raising hand and arguing
Side view of a teen girl in sportswear raising hand and arguing
Side view of a teen girl in sportswear raising hand and arguing
Three-quarter view of a young female in casual clothes putting hands in pocket and greeting
Front view of a perplexed female doctor holding a pen with a tablet and looking at camera
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
Three-quarter view of a teen girl in sportswear raising hands and reasoning
Front view of a young female looking at camera and pointing straight her pen
Front view of a teen girl in sportswear looking at her hand
Front view of a surprised female doctor looking aside and touching chin
Front view of a female doctor smiling and touching chin
Three-quarter view of a pouting young man in casual clothes holding hands together
Front view of a pouting young man in casual clothes holding hands together
Front view of a pouting young man in casual clothes holding hands together
Three-quarter view of a gesticulating young man in red pullover
Three-quarter view of a thoughtful young dark-skinned man in yellow t-shirt raising hand
Side view of an old man talking and gesticulating
Side view of a teen girl in sportswear raising hand and arguing
Three-quarter view of thoughtful old man touching chin
Front view of an old smiling man gesticulating with his eyes closed
Side view of a grimacing businesswoman in a black suit
Side view of an old man talking and gesticulating while looking at camera
Side view of a teen girl in sportswear raising hand and arguing