UnScramble this Word: p k a o p o s a?

Questions

Who wrote the words to the popular victorian ballad Come into the garden Maud?

Who introduced the terms negative and positive in relation to electricity?

From which bridge was Wordsworth enjoying the view when he wrote Earth has not anything to show more fair?

Which Blue Peter presenter had a dog called Shep?

What living asterisk moves at 15cm per minute?