IN: Is it true that is the winter solstice the shortest day of the year?

The winter solstice (or hibernal solstice), also known as midwinter, is an astronomical phenomenon marking the day with the shortest period of daylight and the longest night of the year. In the Northern Hemisphere this is the December solstice and in the Southern Hemisphere this is the June solstice.

OUT: yes

IN: Is it true that can some viruses change normal cells to tumor cells?

There are three types of viral infections that can be considered under the topic of viral transformation. These are cytocidal, persistent, and transforming infections. Cytocidal infections can cause fusion of adjacent cells, disruption of transport pathways including ions and other cell signals, disruption of DNA, RNA and protein synthesis, and nearly always leads to cell death. Persistent infections involve viral material that lays dormant within a cell until activated by some stimulus. This type of infection usually causes few obvious changes within the cell but can lead to long chronic diseases. Transforming infections are also referred to as malignant transformation. This infection causes a host cell to become malignant and can be either cytocidal (usually in the case of RNA viruses) or persistent (usually in the case of DNA viruses). Cells with transforming infections undergo immortalization and inherit the genetic material to produce tumors. Since the term cytocidal, or cytolytic, refers to cell death, these three infections are not mutually exclusive. Many transforming infections by DNA tumor viruses are also cytocidal.

OUT: yes

IN: Is it true that is the president the head of the military?

According to Article II, Section 2, Clause I of the Constitution, the President of the United States is ''Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States.'' Since the National Security Act of 1947, this has been understood to mean all United States Armed Forces. U.S. ranks have their roots in British military traditions, with the President possessing ultimate authority, but no rank, maintaining a civilian status, other than the title of Commander in Chief. The exact degree of authority that the Constitution grants to the President as Commander in Chief has been the subject of much debate throughout history, with Congress at various times granting the President wide authority and at others attempting to restrict that authority.

OUT: yes

IN: Is it true that do all electrons have a net magnetic moment?

Electrons and many elementary particles also have intrinsic magnetic moments, an explanation of which requires a quantum mechanical treatment and relates to the intrinsic angular momentum of the particles as discussed in the article Electron magnetic moment. It is these intrinsic magnetic moments that give rise to the macroscopic effects of magnetism, and other phenomena, such as electron paramagnetic resonance.

OUT:
yes