IN: Is it true that is the very first mcdonald's still open?

A museum also exists at the original McDonald's site in San Bernardino on U.S. Route 66 in California. It is a reconstruction operated by the owner of the Juan Pollo chain and is not affiliated with McDonald's Corporation.

OUT: no

IN: Is it true that is it possible to send a letter without return address?

The return address is not required on postal mail. However, lack of a return address prevents the postal service from being able to return the item if it proves undeliverable; such as from damage, postage due, or invalid destination. Such mail may otherwise become dead letter mail.

OUT: yes

IN: Is it true that are mung beans the same as moong dal?

The mung bean (Vigna radiata), alternatively known as the green gram, maash, or moong Sanskrit / mUgd, is a plant species in the legume family. The mung bean is mainly cultivated in India, Pakistan, Bangladesh, Nepal, Sri Lanka, China, Korea, South Asia and Southeast Asia. It is used as an ingredient in both savory and sweet dishes.

OUT: yes

IN: Is it true that is the word ain't in the english dictionary?

Ain't as a contraction for has not/have not first appeared in dictionaries in the 1830s, and appeared in 1819 in Niles' Weekly Register: Strike! Why I ain't got nobody here to strike... Charles Dickens likewise used ain't to mean haven't in Chapter 28 of Martin Chuzzlewit (1844): ''You ain't got nothing to cry for, bless you! He's righter than a trivet!''

OUT:
yes