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Why can a damaged QR code still work?

A scratch or stain does not always stop a QR code from being read. Its stored information includes redundancy, but that does not mean any part of the image can be covered without consequence.

3–5 min

Questions you could explore

  • How can extra information help recover something missing?
  • Why do the location and kind of damage matter?

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Computers and AI

How does a website name become an internet address?

You remember a website by its name, while the network needs an address for the connection. DNS supplies that translation, sometimes from a saved answer and sometimes by asking other servers.

4–5 min

How does a website name become an internet address?

Computers and AI4–5 minYou remember a website by its name, while the network needs an address for the connection. DNS supplies that translation, sometimes from a saved answer and sometimes by asking other servers.

Computers and AI

Same emoji, different picture

The same emoji can arrive with a different expression or style from the one you saw when sending it. Unicode identifies characters and sequences, while software platforms choose artwork and decide what their versions support.

2–3 min

Same emoji, different picture

Computers and AI2–3 minThe same emoji can arrive with a different expression or style from the one you saw when sending it. Unicode identifies characters and sequences, while software platforms choose artwork and decide what their versions support.

Computers and AI

Can counting repeats make a picture smaller?

A row of identical pixels contains a lot of repetition. Run-length encoding stores how long each stretch lasts, but the saving depends on the pattern and on how the counts themselves are recorded.

3–5 min

Can counting repeats make a picture smaller?

Computers and AI3–5 minA row of identical pixels contains a lot of repetition. Run-length encoding stores how long each stretch lasts, but the saving depends on the pattern and on how the counts themselves are recorded.

Why can a damaged QR code still work? | Speech Topic | speaking.app