Hypothesis
Male doctor using desktop computer while coworkers working in background at hospital
Close-up of cat looking at red sock on carpet, view from behind
Midsection of students playing with toy blocks on table
High angle view of man reading book with microphone
Portrait of confident young man standing by cherry tree at night
A group of asian students reading books.
Portrait of woman sitting by laptop at home
Tropical green background. green lover concept
Close-up of girl crafting with clay on table
Back view of athletic female in sportswear walking towards stadium for training in summer
Portrait of a health worker
Business people sitting at conference table in brightly lit board room
Trendy female with pink hair and tattoos on legs standing near shabby building in urban area and covering face
Business professionals having video conference meeting in board room
High angle view of female students preparing science project at desk in high school classroom
Portrait of young man holding aloft his hand
Tourist in carpathian mountains landscape photo
Man working at construction site
Woman hand holding plastic fork
Portrait of young woman with eye glasses in library
Close-up of light bulb hanging outdoors
Portrait of female chef in commercial kitchen
Portrait of confident young woman with hand in hair standing outdoors
Cropped unrecognizable african american male athlete playing basketball on court in summer and looking at camera
Confident woman standing at home
Close-up portrait of young woman holding eyeglasses
High angle view of multi-ethnic business team discussing while sitting at desk in creative office
Businesswoman in green office looking out of window
Young african american hipster male with curly hair and beard wearing warm jacket looking at camera while standing against shabby wall
Smiling businesswoman in discussion with colleague during meeting at office
Portrait of confident young woman at home
Close-up of abstract lights over black background
Black woman with braids on the beach jumping on the beach
Male and female business colleagues discussing in meeting at table in creative office
Young woman looking at book
Portrait of confident young woman sitting on wood against graffiti wall in city
Close-up of businesswoman and man talking at office
Female doctor discussing with male doctor in medical room seen through glass
Side view of young woman in book
Cropped hand of doctor holding syringe
Portrait of confident young woman at home
Portrait of a cute happy preschool boy at home or in a cafe draws.
Close-up of scientist holding bottle
Side view of smiling businessman using smart phone while sitting by businesswoman at desk in creative office
Woman standing by car on road
Panoramic view of the zeeland bridge on the eastern scheldt, netherlands.
Portrait of man wearing mask
Professional photographer walking on log at ibon del plan lake against mountains, huesca, spain
Scenic view of lake against sky at night
Hand holding glass bottles on table
Mixed peaces of the colorful jigsaw puzzle
Rear view of man holding smart phone
Midsection of young woman reading book by tree
Young woman artist drawing in spiral notebook
Male engineer examining product with mature technician in illuminated industry
Female programmer working on computer with male colleagues at desk in office
Rear view of children walking in forest
Cute boy sitting on play equipment
Male owner looking away while leaning on table at store
Side view of young bearded guy in stylish black clothes and hat smoking cigarette and looking away thoughtfully while sitting near shabby concrete wall on street
Hand holding light bulb in nature on green background for energy concept.
Portrait of a young woman on a sunny day in autumn
Portrait of confident young woman sitting on wood against wall in city
Close-up of empty chair on table at home
Scenic view of landscape against sky
Side view of unrecognizable young ballerina with long curly hair in pointe shoes embracing knees while sitting on haunches in subway station
Overhead view of shirtless boys painting on canvas at home
Man in winter clothes climbs ski slope to the top with help of climbing poles for better stability
Side view of strong determined sportsman performing boxing exercise during workout in modern sport gym with training woman in background
Crop unrecognizable scientist in white gloves checking weed plant in greenhouse while working on alternative medicine research
Young ethnic curly haired sportswoman with smartphone on shoulder holder and headphones on neck standing against green trees and looking at camera during training in park
Businessman working while standing by table at factory
Woman sitting in a cafe at a table with a dreamy look
Close-up portrait of confident young woman in city
Architect checking construction plan with owner of the new home
Male athlete high jump in athletics competition
Modern ethnic female in trendy coat and with bag walking on pedestrian street and looking at camera
Portrait of man wearing protection
Green leaves natural background and wallpaper
Tranquil female with flying hair and in black turtleneck looking at camera in room against white wall
View of white bathroom
Confident african american female in trendy outfit and sunglasses with long braided hair looking away in city street
Glass transparent ball on a stump overgrown with moss. planet earth protection concept
Cropped hands of businesswoman using laptop computer with colleague in board room
Entrance of building
Low angle view of woman jumping against sky
Woman holding a red cabbage in front of her face
Side view of man smoking cigarette on building terrace
Spider web and spotted light
Two mirror balls illuminated by bright light lie on dark blue background with reflections
Focused young female in casual wear browsing modern netbook while sitting at table in contemporary apartment
Optimistic young ethnic female in activewear listening to music with smartphone and headphones and doing back bend exercise during fitness training on green grass in park
Portrait of woman alone in field thinking
Close-up portrait of young woman holding hat
Architect with file analyzing at construction site on sunny day
Man wearing protective suit standing against mirrors at hospital
Confident man looking up against black background
Portrait of happy friends against trees
Rear view of man standing by window
Dreamy young curly haired bearded ethnic male with piercing in ear wearing stylish clothes and cap looking away while standing on green meadow against blurred mountains