Which saying means you should act quickly while an opportunity lasts?
AnswerStrike while the iron is hot
Blacksmiths shape metal best while it is hot, so the phrase urges acting while conditions are right.
Challenge · Facts & stats
Opportunity facts & stats
7 fact-checked facts about opportunity, opportunity cost and the Opportunity rover, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does the saying 'opportunity knocks but once' suggest?
AnswerA good chance may not come again, so take it
The proverb warns people to be ready to act, because a good chance may not return.
Going deeper
What was the name of Opportunity's twin rover, which landed a few weeks earlier in 2004?
AnswerSpirit
The two identical rovers landed on opposite sides of Mars in January 2004.
Opportunity was planned to work for about 90 Martian days. Roughly how long did it actually operate?
AnswerAbout 15 years
It landed in January 2004 and sent its last signal in June 2018, far outlasting its planned mission.
In economics, what does a 'trade-off' mean?
AnswerGiving up some of one thing to get more of another
Because time and resources are limited, getting more of one thing usually means having less of another.
Expert level
Roughly how far did Opportunity drive during its mission on Mars?
AnswerAbout 45 km
Opportunity covered just over 45 km, a little more than the length of a marathon.
In economics, what does a production possibilities frontier show?
AnswerThe trade-offs in producing two goods with limited resources
Points on the curve show the maximum combinations of two goods; moving along it reveals what must be given up.
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