A positively charged particle in the nucleus of an atom is a . A particle of light is a .

What is cosmic inflation?

How can we know the Sun’s atmosphere contains neon vapor?

According to General Relativity, what is gravity?

Suppose an electron in an atom jumps from energy level 2 to energy level 4. Where does the extra energy come from?

According to experiment, which interpretation correctly describes the fundamental nature of reality?

Suppose you are on a spaceship flying toward Earth at 0.9c, where c is the speed of light. In your frame of reference your ship is 10 meters long (front-to-back). How long is your ship, as measured from Earth’s surface?

A 29-year-old woman presents with intermittent visual disturbances, right arm weakness, and numbness in the left leg. MRI of the brain and spinal cord reveals multiple demyelinating lesions in both supratentorial and spinal regions. Which of the following best explains the asymmetric and varied presentation of her symptoms?

According to our class discussion, the author in Pirandello’s “Six Characters in Search of an Author” is somewhat like a                   

Where did Hedda Gabler acquire her pistols?