Science News Quiz #4

News reports have revealed that astronauts who do spacewalks are suffering from onycholysis! What is that?

An Australian mosquito has been discovered that, when feeding on the blood of frogs, always seems to take blood from the same part of the frog's anatomy. What body part does the mosquito feed upon?

A new planetary system called HD 110067 has been discovered where six planets move in harmony, with each planet's time to orbit the star being a nice ratio of the other planets' orbital times. In our solar system that doesn't happen. Which planet among those listed takes the longest to orbit the sun once?