If the quickest route between two points is a straight line, what's one who is traveling from Boston to Paris and needs to get there soonest to do?
Einstein's theory of relativity unified these and created a four-dimensional space that is an analogue to our three-dimensional space, except that the "distance" between two points need not be positive.
"It means if you take an area one degree by one degree, latitude by longitude, which at the equator is roughly 100km by 100km, you can take any two points in the DEM and the error between the two points is less than two metres, " he told me.
Specs deploys digital safety cameras in pairs to electronically record drivers' average speeds between two fixed points.
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The longer the distance between the two points in physical space, the more effort it takes to get an object from point A to point B.
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They also synchronized the clocks between the two information points using quantum entanglement.
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Probably the crucial moment of the match came between the two Monaghan points with Thomas Freeman appearing to have a pointblank goal chance but a Kerry defender made a sensational block to divert the ball out for a 45.
The bad reason is that he expects a rise in the tax take of two percentage points between 2004-05 and 2007-08, taking it to its highest for two decades, without a tax-raising budget.
The Worcestershire club put two points between themselves and bottom club Bedford Athletic, Gregg Summers helping himself to a first-half hat-trick of tries.
Given actual exchange-rate movements, the IMF reckons that if the only thing surplus countries had done was to let their currencies rise, then growth might have ended up declining by between two and four percentage points.
According to a study by Young Lee and Roger Gordon of Hanyang University, South Korea and University of California, San Diego, that alone would increase economic growth by between one and two percentage points a year for five years to come.
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The other reason is that declaring a match between two prints generally requires a certain number of points of similarity between them.
Implied yields fell between two and 10-basis points at further maturities as dealers predicted the Reserve Bank would be more likely than not to loosen policy at some point.
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Similarly, it seems that women are more likely to work part-time in countries that protect that desire, as the gap between the women working part-time in the other countries and women doing the same here at home grew by two percentage points between 1990 and 2010.
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However, two points from Cody and a Robert Foley score then left four points between the sides as the game entered injury-time.
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Through the fog of battle, some surprising points of common ground between the two main parties can be glimpsed.
Sunday's result at White Hart Lane meant that the gap between the two north London clubs stretched to seven points as Tottenham vaulted into third place in the Premier League, just two points off the second spot.
All of this analysis points to a robust competition between the two parties over the past two decades, with no permanent winners or losers and no emerging natural majority for either party.
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For conflict to exist, there must be at least two points of view, or stories, between which we are undecided as to which to believe.
In fact, the hypotenuse is a line between two angles, so what is wrong with a fourth person being the hypotenuse between two of the three people who are presumably at the points of the triangle?
The margin between both men for the second round has widened by two percentage points since last week's poll.
As the difference between the two parties seems to be only 2-3 percentage points, the outcome may be too close to call.
They found that sleep deteriorates at two points in a person's life - between the ages of 16 and 25 and again between the ages of 35 and 50.
Municipal bonds are two-to-four basis points weaker at maturities between 2023-2041 in quiet trading conditions.
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Derry have won one, drawn one and lost one in the three league encounters between the sides this season and lie fourth in the division, two points behind Cork.
Houston eventually settled in and charged back with a 13-2 push spanning the break between the first two quarters, with Chandler Parsons providing the final five points on a two-handed putback jam and a 3-pointer.
At various points in its history, such as the period between the two world wars, isolationism has played a powerful role in American politics.
McGeechan praised the contribution of Wales fly-half James Hook, whose 16 points from penalties and two conversions ultimately made the difference between victory and defeat.
They were found at various points of a two-mile section of the river, between Bishopswood, Ross-on-Wye, and Lydbrook in Gloucestershire.
However, Dublin's attempts to play out time then floundered as Fergal Doherty, Conleth Gilligan and both the Bradley brothers hit points to leave a kick of the ball between the teams with two minutes of normal time left.
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