Licensing and/or Certification. No licensure or certification is necessary to become a physical therapy aide. Necessary Skills and Qualities. PT aides assist clients during their physical therapy exercises and treatments under the supervision of a physical therapist or physical therapy assistant. That means that a physical therapy aide should be physically fit, with the ability to kneel, bend and lift.
1 Top notes: This is what you smell immediately upon applying your perfume. It's the scent that first hits your nose, but then evaporates quickly.  Middle notes: The middle notes emerge as the top notes are dissipating and make up the majority of the scent.
One of our first year labs helps you understand why perfumes smell the way they do. In fact you start doing some chemistry yourself as soon as your eyes open - your sense of vision works because a small organic molecule changes shape in the back of your eye when light hits it. Chemistry is truly the central science.