The Viafocus library
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Intermediate
MathematicsGrades 4, 5, 6
Grandpa Never Loses — How to always win the 21 matchstick game (Nim)
22 questions · 15 min
VViafocus
Beginner
MathematicsGrades 4, 5, 6
The Short Order — Why does serving the quickest first make everyone wait less?
26 questions · 15 min
VViafocus4.0
Beginner
ScienceGrades 4, 5, 6
The Wait — How does radar work, and how does it find a plane nobody can see?
29 questions · 16 min
VViafocus
Intermediate
ScienceGrades 5, 6, 7
Four Marks — How do you survive lost in the wild, and what kills you first?
30 questions · 16 min
VViafocus
Beginner
ScienceGrades 4, 5, 6
Wake the Needle — What is a magnet, and how does a compass work?
26 questions · 15 min
VViafocus
Beginner
ScienceGrades 4, 5, 6
Nobody Leads — How do thousands of birds fly in one flock without crashing?
12 min
VViafocus
Beginner
MathematicsGrades 4, 5, 6
Three and a Bit — Why is pi 3.14, and what is pi actually measuring?
28 questions · 15 min
VViafocus3.0
Beginner
ScienceGrades 4, 5, 6
Six Nights — Why do you have to finish your antibiotics even when you feel better?
11 questions · 9 min
VViafocus3.0
Beginner
Physical EducationGrades 4, 5, 6
Beat the Flag
21 questions · 12 min
VViafocus
Beginner
GeographyGrades 4, 5, 6
The Map Lied — Why does Greenland look as big as Africa on a world map?
13 questions · 12 min
VViafocus5.0
Beginner
ScienceGrades 4, 5, 6
Thin Ice — What is pressure?
11 questions · 7 min
VViafocus
Intermediate
OtherGrades 4, 5, 6
Who Really Won? — How votes get counted, and why the rule can change the winner
24 questions · 14 min
VViafocus