Riddle

What has a mouth, but cannot speak? 

What has four wheels and flies? 

What has a dish, but never eats? 

A bed, but never lies?   

What walks upon all fours at night 

But walks on five at noon? 

What sparkles in the summer sun 

And shimmers ’neath the moon?   

What’s old today but young tomorrow? 

What’s both clean and dirty? 

What is lighter than the breeze, 

But solid, strong, and sturdy?   

What smells a lot but has no nose? 

What’s eyeless, but can see? 

What’s conquering your planet now? 

You guessed them all—it’s me!