A Kilogram Is Now a Kilogram—Forever | SciShow News

The video discusses the redefinition of the kilogram, which was previously based on a physical object known as Le Grande K. Scientists have now tied the kilogram to Plank's constant, ensuring a stable and universal standard. This change was made possible by the kibble balance, a device that measures mass in terms of energy. The video also explores a study on the genetic basis of taste sensitivity, particularly bitterness, and its impact on coffee consumption. The study found that people more sensitive to caffeine's bitterness tend to drink more coffee, suggesting a complex interplay between genetics, taste, and behavior.

What was the main reason for redefining the kilogram?

• To make it heavier

• To tie it to universal constants

• To make it lighter

• To change its shape

What was the original definition of a kilogram based on?

• A grain of sand

• A specific metal cylinder

• A liter of water

• A block of ice

What is the role of the kibble balance in the new kilogram definition?

• It measures weight using a pendulum

• It is a type of dog food

• It uses an electromagnet to measure weight in terms of energy

• It measures weight using a spring

What is the significance of Plank's constant in the new kilogram definition?

• It relates energy to frequency

• It is a measure of temperature

• It is a unit of time

• It measures volume

Why do some people enjoy the bitterness of coffee according to recent research?

• They associate bitterness with caffeine's effects

• They have a genetic mutation

• They cannot taste bitterness

• They dislike sweet flavors

What did the research team use to study the genetic influence on taste perception?

• A small group of participants

• A massive data set from the UK

• A survey of coffee brands

• A taste test of various drinks

How does genetic sensitivity to caffeine affect coffee consumption?

• It has no effect on coffee consumption

• It makes people prefer tea

• It increases the likelihood of drinking more coffee

• It decreases coffee consumption