"[the good of counting is that] it brings every thing to a certainty, which before floated in the mind indefinitely." Samuel Johnson #IsThatABigNumber? isthatabignumber.com/home/

Distance from London to Edinburgh (535 km) is 10 x Full length of Broadway in NYC (53 km) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

Time since the start of the Iron Age (3,200 y) is 40 x Lifespan of modern human being (~80 y) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

Distance from London to New York (5,580 km) is about the same as the length of the Yenisei River in Siberia (5,540 km) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

Height of Mt Washington, highest point in NE USA (1.917 km) is 5 x Height of the Empire State Building (NYC) (381 m) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

"The world is full of magical things patiently waiting for our wits to grow sharper." Bertrand Russell #IsThatABigNumber? isthatabignumber.com/home/

Estimated world population of Cattle (1.5 billion individuals) is 1 thousand x Estimated world population of Moose / Elk (1.5 million individuals) #IsThatABigNumber? #RandomComparison isthatabignumber.com/itabn/compare?…

"The wonder is, not that the field of the stars is so vast, but that man has measured it." Anatole France #IsThatABigNumber? isthatabignumber.com/itabn/compare?…

"The book of nature is written in the language of Mathematics." Galileo #IsThatABigNumber? isthatabignumber.com/itabn/compare?…

Length of the USA / Canada border (8,890 km) is about as same as the length of the Great Wall of China (8,850 km) #IsThatABigNumber? #RandomComparison isthatabignumber.com/itabn/compare?…

"Mathematics, rightly viewed, possesses not only truth but also supreme beauty - a beauty ... like that of sculpture." Bertrand Russell #IsThatABigNumber? isthatabignumber.com/home/

Height of the Washington Monument in Washington, DC (169 m) is 4 x Height of the Antares 230 launch rocket (42.5 m) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

"Measurement is the first step that leads to control and eventually to improvement. If you can’t measure something, you can’t understand it.” H. James Harrington #IsThatABigNumber? isthatabignumber.com/home/

Time since start of building of the Colosseum (1,948 y) is 25 x Time since introduction of the first mass-produced helicopter (Sikorsky R-4) (78 y) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

Circumference of Neptune (154,600 km) is 10 x Circumference of Mercury (15,330 km) #IsThatABigNumber? #RandomComparison isthatabignumber.com/home/

"If knowledge can create problems, it is not through ignorance that we can solve them." Isaac Asimov #IsThatABigNumber? isthatabignumber.com/home/

"Explore the world. Nearly everything is really interesting if you go into it deeply enough." Richard Feynman #IsThatABigNumber? isthatabignumber.com/home/

Delighted to see a review from Cambridge Mathematical Gazette, of our book on probability: "What are the Chances of That?" cambridge.org/core/journals/… "A particular strength of this book is its lively style, not at all dumbed down, but full of interest and even enthusiasm." cont...