- Required course materials:
Optimal A2 Lehrbuch (course book), ISBN# 978-3-468-47031-8
Optimal A2 Arbeitsbuch mit Lerner Audio-CD (workbook with CD), ISBN# 978-3-468-47032-5
Optimal A2 Glossar Englisch (glossary), 978-3-468-47040-0
Optimal A2 Audio-CDs (2), ISBN# 978-3-468-47035-6
(These are the same materials used in all A2-level courses, i.e. A2.1, A2.2 and A2.3) - Emile Gagnan and Jacques Cousteau invented the modern demand regulator and an improved autonomous diving suit. In 1942, redesigned a car regulator and invented a demand regulator that would automatically fresh air when a diver breathed. A year later in 1943, Cousteau and Gagnan began selling the Aqua-Lung.
