Why do sunsets often look reddish?
A) Earth's shadow on the Moon can be seen from Earth's night side B) A long atmospheric path scatters away […]
Every Day Science, Scientific Reasons
Scientific Reasons
Every Day Science, Scientific Reasons
Why do vaccinations protect against some later infections?
A) They may lack oxygen for respiration B) Nerve signals stimulate salivary glands C) They prepare immune memory against a […]
Every Day Science, Scientific Reasons
Why do we blink often?
A) They prepare immune memory against a pathogen B) They may lack oxygen for respiration C) Nerve signals stimulate salivary […]
Every Day Science, Scientific Reasons
Why do thermos bottles use a vacuum gap between their walls?
A) Solid water is less dense than liquid water B) Moving air increases convective and evaporative heat loss C) They […]
Every Day Science, Scientific Reasons
Why do we see lightning before hearing thunder?
A) Thunder occurs later B) Light travels much faster than sound C) Sound cannot travel in air D) Lightning creates […]
Every Day Science, Scientific Reasons
Why do we see ocean tides?
A) The Moon's gravity and Earth's rotation create tidal bulges B) Dense cold air lifts warm moist air quickly C) […]
Every Day Science, Scientific Reasons
Why do wide snowshoes reduce sinking into snow?
A) Higher temperature often speeds particle movement and dissolution B) Iron is attracted strongly by the magnetic field C) Air […]
Every Day Science, Scientific Reasons
Why does a battery-powered torch turn off when the switch opens?
A) The open switch breaks the current path B) Changing magnetic flux induces a voltage C) Reflected sound has a […]
Every Day Science, Scientific Reasons
Why does a bicycle pump warm during rapid compression?
A) All air becomes liquid B) Work done on the air raises its temperature C) The pump absorbs moonlight D) […]
Every Day Science, Scientific Reasons
Why does a bicycle use gears?
A) The ship displaces enough water with its hollow shape B) Sand grains are too large to pass through the […]