Sharper Blades for Mars Helicopters
In the app: the whole story at your level, listening, the quiz and the word cards.
The same story at six levels
How the first sentence reads at every level, from A1 to C2.
- A1
NASA and universities are testing new helicopter blades.
- A2
Engineers at NASA and partner universities are testing a new helicopter blade design.
- B1
Engineers at NASA, the US space agency, and partner universities are testing a thinner, sharper helicopter blade design.
- B2
Engineers at NASA, the US space agency, and partner universities are testing a thinner, sharper helicopter blade design.
- C1
NASA's Ingenuity helicopter became the first powered craft to achieve flight on another planet.
- C2
When NASA's Ingenuity helicopter became the first powered craft to achieve flight on another planet, it had to contend with an atmosphere that is very thin and has a lower speed of sound than Earth's.
Key words
Words from the B1 text, with their meaning.
- intend
- to have a plan or purpose for something
- uneven
- not flat, smooth, or equal in all parts
- adjust
- to change something slightly so that it works better in a new situation
- journal
- a serious magazine written by and for experts in a particular subject
- efficiency
- working well and quickly without wasting time or energy
- recovery
- the process of returning to a normal or safe state after a problem
Rewritten with AI from facts reported by NASA. Read the original for the full report.