60http://nrich.maths.org/stemnrichen 2012 http://nrich.maths.org/public/terms.phpThese problems explore the science of genetics in which probability and statistics are key.http://nrich.maths.org/9138Sat, 01 Sep 2012 00:00:01 +0100Explore the properties of isometric drawings.http://nrich.maths.org/8403Wed, 01 Aug 2012 00:00:01 +0100Explore the properties of oblique projection.http://nrich.maths.org/8402Wed, 01 Aug 2012 00:00:01 +0100Explore the properties of perspective drawing.http://nrich.maths.org/8399Wed, 01 Aug 2012 00:00:01 +0100The design technology curriculum requires students to be able to represent 3-dimensional objects on paper. This article introduces some of the mathematical ideas which underlie such methods.http://nrich.maths.org/8396Fri, 01 Jun 2012 00:00:01 +0100How would you design the tiering of seats in a stadium so that all spectators have a good view?http://nrich.maths.org/7484Wed, 01 Jun 2011 00:00:01 +0100A problem about genetics and the transmission of disease.http://nrich.maths.org/7427Wed, 01 Jun 2011 00:00:01 +0100Examine these estimates. Do they sound about right?http://nrich.maths.org/7418Wed, 01 Jun 2011 00:00:01 +0100Make an accurate diagram of the solar system and explore the concept of a grand conjunction.http://nrich.maths.org/7268Tue, 01 Feb 2011 00:00:01 +0000What is the chance I will have a son who looks like me?http://nrich.maths.org/7069Fri, 01 Jul 2011 00:00:01 +0100Use trigonometry to determine whether solar eclipses on earth can be perfect.http://nrich.maths.org/6683Tue, 01 Feb 2011 00:00:01 +0000Many physical constants are only known to a certain accuracy. Explore the numerical error bounds in the mass of water and its constituents.http://nrich.maths.org/6516Tue, 01 Feb 2011 00:00:01 +0000Estimate these curious quantities sufficiently accurately that you can rank them in order of sizehttp://nrich.maths.org/6505Tue, 01 Feb 2011 00:00:01 +0000Can you work out the parentage of the ancient hero Gilgamesh?http://nrich.maths.org/6315Tue, 01 Feb 2011 00:00:01 +0000When you change the units, do the numbers get bigger or smaller?http://nrich.maths.org/6146Tue, 01 Feb 2011 00:00:01 +0000Are these estimates of physical quantities accurate?http://nrich.maths.org/6145Tue, 01 Feb 2011 00:00:01 +0000An observer is on top of a lighthouse. How far from the foot of the lighthouse is the horizon that the observer can see?http://nrich.maths.org/2357Tue, 01 Feb 2011 00:00:01 +0000