An elderly man with gray hair working with electrical appliances.
Lab technician working on tests
Lab technician working on tests
Lab technician working on tests
Lab technician working on tests
Industrial worker assembling electrical motor on automatical equipment. Close up assembly electrical engine on conveyor. Production electrical appliances on plant
Elderly man working on laptop outdoors
Elderly scientist checking virus evolution looking at samples in modern equipped laboratory. Senior doctor working with various bacteria tissue and blood tests, pharmaceutical research for antibiotics