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1015 Question

1. Why Charge to 80% for Battery Life

Lithium-ion: if kept at high charge level for extended periods, especially in warm condition, they can degrade faster over time. Why

  • higher voltage, the more stress applied to battery’s chemistry
  • Uneven deposition of lithium on the anode, cause permanent capacity loss
  • Heat accelerate all the degradation process

2. Why Pineapple Crown can Grow

  • Meristematic cell on the base of a pineapple crown
  • Tissue differentiation: remove a crown and allowing it dry for a day or two
  • Plant hormones

2.1. Sense to Environment?

Largely governed by hormones

  • Gravitropism
  • Contact with soil, from open air to more humid, dark and compact medium
  • Light exposure changed the hormones distribution

3. Rose Color

Complex interplay of

  • Genetic factors: pigment, modifier, suppressor
  • Biochemical factors: pH level, metal ions,
  • Environmental factors: temperature, light, soil