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- 18:11, 18 December 2019 (diff | hist) (+1,839) Repeatable (current)
- 18:04, 18 December 2019 (diff | hist) (+261) Relay Neuron (current)
- 18:04, 18 December 2019 (diff | hist) (+846) Relative Formula Mass (current)
- 18:03, 18 December 2019 (diff | hist) (+846) Relative Atomic Mass (current)
- 18:02, 18 December 2019 (diff | hist) (+826) Refraction (current)
- 18:01, 18 December 2019 (diff | hist) (+1) Reflex Arc (current)
- 18:00, 18 December 2019 (diff | hist) (+545) Reflex Arc
- 18:00, 18 December 2019 (diff | hist) (+820) Reflection (current)
- 17:59, 18 December 2019 (diff | hist) (+825) Reduction (current)
- 17:50, 18 December 2019 (diff | hist) (+523) Red Shift (current)
- 17:49, 18 December 2019 (diff | hist) (+561) Redox Reaction (current)
- 17:49, 18 December 2019 (diff | hist) (+823) Red Blood Cell
- 17:48, 18 December 2019 (diff | hist) (+796) Recycling (current)
- 17:48, 18 December 2019 (diff | hist) (+771) Reciprocal (current)
- 17:47, 18 December 2019 (diff | hist) (+820) Recessive Allele (current)
- 17:47, 18 December 2019 (diff | hist) (+794) Receptor Cell (current)
- 17:47, 18 December 2019 (diff | hist) (+260) Real Image (current)
- 17:46, 18 December 2019 (diff | hist) (+1,117) Reactivity (current)
- 17:32, 18 December 2019 (diff | hist) (+832) Reactivity Series (current)
- 17:31, 18 December 2019 (diff | hist) (+1,050) Human Reaction Time (current)
- 17:31, 18 December 2019 (diff | hist) (+2,624) Rate of Reaction (current)
- 17:31, 18 December 2019 (diff | hist) (+831) Reaction Profile (current)
- 17:30, 18 December 2019 (diff | hist) (+264) Reactant (current)
- 17:30, 18 December 2019 (diff | hist) (+542) Ray Diagram
- 17:29, 18 December 2019 (diff | hist) (+274) Ray Box (current)
- 17:29, 18 December 2019 (diff | hist) (+748) Ratio (current)
- 17:29, 18 December 2019 (diff | hist) (+568) Rate of Reaction
- 17:28, 18 December 2019 (diff | hist) (+261) Rarefaction (current)
- 17:27, 18 December 2019 (diff | hist) (+819) Range (current)
- 17:27, 18 December 2019 (diff | hist) (+816) Random Sampling (current)
- 17:27, 18 December 2019 (diff | hist) (+1,299) Random Error (current)
- 17:26, 18 December 2019 (diff | hist) (+293) Radioactivity (current)
- 17:25, 18 December 2019 (diff | hist) (+569) Radioactive Decay (current)
- 17:25, 18 December 2019 (diff | hist) (+815) Radiowave (current)
- 17:22, 18 December 2019 (diff | hist) (+8,188) Radiation (current)
- 17:13, 18 December 2019 (diff | hist) (+816) Quadrat (current)
- 17:12, 18 December 2019 (diff | hist) (+542) Pyramid of Biomass (current)
- 17:12, 18 December 2019 (diff | hist) (+260) P-wave (current)
- 17:11, 18 December 2019 (diff | hist) (+272) Pure (current)
- 17:11, 18 December 2019 (diff | hist) (+258) Pupil (current)
- 17:09, 18 December 2019 (diff | hist) (+303) Protractor (current)
- 17:08, 18 December 2019 (diff | hist) (+1,069) Proton (current)
- 17:06, 18 December 2019 (diff | hist) (+545) Protist (current)
- 17:05, 18 December 2019 (diff | hist) (+1,866) Protein (current)
- 17:05, 18 December 2019 (diff | hist) (+255) Protease (current)
- 16:36, 18 December 2019 (diff | hist) (+817) Prokaryotic Cell (current)
- 16:36, 18 December 2019 (diff | hist) (+809) Progesterone (current)
- 16:36, 18 December 2019 (diff | hist) (+268) Product (current)
- 16:35, 18 December 2019 (diff | hist) (+257) Producer
- 16:32, 18 December 2019 (diff | hist) (+259) Probability (current)
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