Welcome home!
This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.
Tweets not working for you?
Hover over the profile pic and click the Following button to unfollow any account.
Say a lot with a little
When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.
Join the conversation
Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.
Learn the latest
Get instant insight into what people are talking about now.
Get more of what you love
Follow more accounts to get instant updates about topics you care about.
Find what's happening
See the latest conversations about any topic instantly.
Never miss a Moment
Catch up instantly on the best stories happening as they unfold.
We are 
The sound is unforgettable, according to people who have experienced an Ariane 5 lifting off. But this week’s question should be really easy for experts like you! 
Second one sounds like a vacuum cleaner
