Problem: The Sun (United Kingdom):

According to Max Clifford: Read All About It, written by Clifford and Angela Levin, La Salle invented the story out of frustration with Starr who had been working on a book with McCaffrey. She contacted an acquaintance who worked for The Sun in Manchester. The story reportedly delighted MacKenzie, who was keen to run it, and Max Clifford, who had been Starr's public relations agent. Starr had to be persuaded that the apparent revelation would not damage him; the attention helped to revive his career. In his 2001 autobiography Unwrapped, Starr wrote that the incident was a complete fabrication: "I have never eaten or even nibbled a live hamster, gerbil, guinea pig, mouse, shrew, vole or any other small mammal."

What was the name of Starr's autobiography?
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A: Unwrapped


Problem: Transistor:

There are two types of transistors, which have slight differences in how they are used in a circuit. A bipolar transistor has terminals labeled base, collector, and emitter. A small current at the base terminal (that is, flowing between the base and the emitter) can control or switch a much larger current between the collector and emitter terminals. For a field-effect transistor, the terminals are labeled gate, source, and drain, and a voltage at the gate can control a current between source and drain.

What are the components of a field-effect transistor?
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A: gate, source, and drain


Problem: Philosophy of space and time:

In the classical case, the invariance, or symmetry, group and the covariance group coincide, but, interestingly enough, they part ways in relativistic physics. The symmetry group of the general theory of relativity includes all differentiable transformations, i.e., all properties of an object are dynamical, in other words there are no absolute objects. The formulations of the general theory of relativity, unlike those of classical mechanics, do not share a standard, i.e., there is no single formulation paired with transformations. As such the covariance group of the general theory of relativity is just the covariance group of every theory.

What else besides  invariance, or symmetry and group part ways in relativistic physics?
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A: the covariance group


Problem: Light-emitting diode:

The current–voltage characteristic of an LED is similar to other diodes, in that the current is dependent exponentially on the voltage (see Shockley diode equation). This means that a small change in voltage can cause a large change in current. If the applied voltage exceeds the LED's forward voltage drop by a small amount, the current rating may be exceeded by a large amount, potentially damaging or destroying the LED. The typical solution is to use constant-current power supplies to keep the current below the LED's maximum current rating. Since most common power sources (batteries, mains) are constant-voltage sources, most LED fixtures must include a power converter, at least a current-limiting resistor. However, the high resistance of three-volt coin cells combined with the high differential resistance of nitride-based LEDs makes it possible to power such an LED from such a coin cell without an external resistor.

What feature do most LED fixtures need to have?
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A:
a power converter