an exceptionally intelligent person or someone with exceptional skill in a particular area of activity
genius
a sudden, dramatic, and important discovery or development
breakthrough
a person who designs, builds, or maintains engines, machines, or structures
engineer
a test of the ability, skill or strength of (someone or something) to be difficult enough to be interesting to (someone)
challenge
the flow of tiny particles called electrons and protons
electricity
a device that does a physical task
machine
a notice or announcement to the public for promoting a product, service, event or a job
advertisement
flow of something such as electricity occurring or existing in the present time
current
a scientific test in which you perform a series of actions and carefully observe their effects in order to learn about something
experiment
an answer to a problem or an explanation
solution
a substance used to make something such as wood, plastic or metal
material
the activity of paying close attention to someone or something in order to get information
observation
