The flag of the United States is one of the nation's most widely recognized symbols. Within the United States, flags are frequently displayed not only on public buildings but on private residences. The flag is a common motif on decals for car windows, and clothing ornaments such as badges and lapel pins.
Ignorance(noun) the condition of being ignorant; the want of knowledge in general, or in relation to a particular subject; the state of being uneducated or uninformed. Ignorance(noun) a willful neglect or refusal to acquire knowledge which one may acquire and it is his duty to have.
What you don't know won't hurt you. For example, She decided not to read the critics' reviews-ignorance is bliss. Although its truth may be dubious at best, this idea has been expressed since ancient times. The actual wording, however, comes from Thomas Gray's poem, Ode on a Distant Prospect of Eton College (1742): Where ignorance is bliss, 'tis folly to be wise..