The mass question

The mass question.

photons, massless particles that always travel at the speed of light. In the past few years, by studying neutrinos emitted by the Sun or created by cosmic rays in the Earth’s atmosphere, physicists have learned that neutrinos actually have tiny but non-zero masses, roughly ten million times smaller than the mass of an electron. These masses are believed to result from physical processes occurri...

A question of mass

“The quantity of any matter is the measure of it by its density and volume conjointly.... This quantity is what I shall understand by the term mass or body in the discussions to follow. It is ascertainable from the weight of the body in question. For I have found by pendulum experiments of high precision, that the mass of a body is proportional to its weight; as will hereafter be shown.” Isaac ...

Investigating Embedded Question Reuse in Question Answering

The investigation presented in this paper is a novel method in question answering (QA) that enables a QA system to gain performance through reuse of information in the answer to one question to answer another related question. Our analysis shows that a pair of question in a general open domain QA can have embedding relation through their mentions of noun phrase expressions. We present methods f...

Body mass index and survival in incident dialysis patients: the answer depends on the question.

2 00 6 The road not considered . . . the question of photon mass

It is well-known that a conflict between Galilean relativity and Maxwell equations of electromagnetic equations was apparent by the end of the 19th century. Equally well-known is the fact that Einstein resolved the conflict by pointing out that the principle of relativity and Maxwell equations can both be correct if the notion of absolute time is abandoned. The rest is history. The purpose of t...