Topic Details (Notes format)

Which cat species cannot retract its claws fully and is known for running speed?

Who discovered Archaeopteryx?

Which language has the most native speakers in the world?

Who discovered the positron?

What is the deepest known point in the Earth’s oceans?

What is the phenomenon called when water vapor changes directly from gas to solid, forming frost?

Which vitamin deficiency leads to rickets in children, affecting bone development?

Which phenomenon is caused by the expansion of air due to lightning, heard as a loud crack or rumble?

Which element has the chemical symbol "Lv"?

Which type of bear is found in the Arctic region?