The Chernobyl nuclear powerplant disaster of April 1986. Reactor construction & design, and control rod flaws. The planned power-down & start of the test, the power-down overshoot and xenon poisoning that led to the power surge and explosion. The alarm bells in Europe. The fall-out, site containment, mass evacuation, prevention of a possible follow-on corium meltdown event, and clean-up operation by the ‘liquidators’. The 1986 ‘sarcophogus’ and the 2010 ‘new safe confinement’ arch. 12 pages (incl. 5 maps, 6 schematic diagrams, 10 contemporary and 5 other photos).

CAIE A2 9709 Maths Integration I. Animated powerpoint. Integration as area, basic rules (incl. 6 trig), numerical integration, reverse chain rule (substitution). 16 slides.

CAIE A2 9709 Maths Differentiation animated powerpoint. Product and Quotient rules, Ln and exponentials, the 6 Trig derivatives, Explicit and Parametric differentiation. 18 slides.

CAIE A2 9709 Trigonometry animated powerpoint. Covering compound angle formulae, double angle formulae, and the conversion into polar form. Incl examples, 10 + 8 slides.