Daily challenge · 8 October 2026
Science and nature
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Question 1
What is the change of liquid water into water vapor called?
- A Condensation
- B Evaporation
- C Freezing
- D Melting
Evaporation is the process by which liquid water becomes water vapor.
Question 2
Which subatomic particle has a negative electric charge?
- A Proton
- B Neutron
- C Electron
- D Photon
Electrons carry a negative electric charge.
Question 3
Which researcher captured the X-ray diffraction image known as Photo 51, which helped reveal DNA's structure?
- A Lise Meitner
- B Rosalind Franklin
- C Barbara McClintock
- D Dorothy Hodgkin
Rosalind Franklin and her colleague Raymond Gosling produced Photo 51 in their work on DNA.
Question 4
In ecology, what is the name for a transition zone between two distinct biological communities?
- A Ecotone
- B Biome
- C Niche
- D Watershed
An ecotone is a zone where neighboring ecosystems or communities meet.
Question 5
About how long is Earth's circumference measured around the equator?
- A 4,008 km
- B 40,075 km
- C 400,750 km
- D 4,007,500 km
Earth's equatorial circumference is approximately 40,075 kilometers.
Question 6
Around what time did the Cambrian Period begin, marking the start of the Cambrian explosion of animal diversity?
- A 541 million years ago
- B 252 million years ago
- C 66 million years ago
- D 2.4 billion years ago
The Cambrian Period began about 541 million years ago.
Question 7
According to Mendel's law of segregation, what happens to the two alleles for a gene when gametes form?
- A They always remain together in the same gamete
- B They separate, so each gamete receives one allele
- C They combine into a new allele
- D They are both discarded
The law of segregation states that the two alleles separate during gamete formation.
Question 8
Marie Curie received Nobel Prizes in which two scientific fields?
- A Physics and Chemistry
- B Chemistry and Medicine
- C Physics and Physiology
- D Medicine and Peace
Curie received the 1903 Nobel Prize in Physics and the 1911 Nobel Prize in Chemistry.
Question 9
Approximately how long is the half-life of carbon-14?
- A 573 years
- B 5,730 years
- C 57,300 years
- D 573,000 years
Carbon-14 has a half-life of about 5,730 years.
Final question
Which element was first produced artificially in 1937 by Carlo Perrier and Emilio Segrè?
- A Astatine
- B Technetium
- C Promethium
- D Francium
Perrier and Segrè identified technetium in material produced by bombarding molybdenum with deuterons.