he was an enthusiastic teacher both of graduates and undergraduates, and was a "character" particularly in his later years, winning the affection both of mathematicians and of a wider circle.

Please write the text above using proper case.

A: **He was an enthusiastic teacher both of graduates and undergraduates, and was a "character" particularly in his later years, winning the affection both of mathematicians and of a wider circle.**

the big bad piranha is back and hungrier than ever!

Please write the text above using proper case.

A: **The big bad piranha is back and hungrier than ever!**

looking which airport for riederalp?

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A: **Looking which airport for Riederalp?**

the volume level is represented graphically in percentage or decibels (db).

Please write the text above using proper case.

A:
**The volume level is represented graphically in percentage or decibels (dB).**