Over time, the babies' immune systems start to distinguish between friend and foe in the microbial world, and launch attacks on potentially harmful bugs while leaving beneficial ones, like those that live in the gut, alone.
Still, this is a story that cannot be told without Breton because such was his dominating personality that, with the exception of Duchamp, Picasso and the aging Matisse, all the poets, writers and artists of the day were forced to define themselves as his friend or foe (and many of course went from friend to foe).
One of the most difficult things in life is to draw the line between friend and foe.
Excerpt: As friend and foe alike recognised at the end of January 1806, Pitt had bestridden a confusing and rapidly changing world with authority.
You are perceived as powerful when you show you can tell friend from foe, and stand with the former against the latter.
Friend and foe alike are trying to take the measure of Mr. Obama, and to test him.
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Obama's behavior since last January 25 has made clear to US friend and foe alike that under Obama, the US is more likely to attack you if you display weakness towards it than if you adopt a confrontational posture against it.
I'm not nearly as optimistic that Republicans won't capitulate in the weeks ahead, but this is quintessential Grover, one of the few people in Washington known by friend and foe alike by his first name.
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Even as we acknowledge that each country is different, we need to speak honestly about the principles that we believe in, with friend and foe alike.
Aside from its imperative to lash out at Israel, Obama's ideological predisposition would permit him to happily sit on the sidelines and do nothing against US foe or friend alike.
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Item: Although top Baathists have not publicly admitted it, it is universally believed that Hussein ordered the execution of Ayatollah Sayyid Muhammad Baqr al-Sadr, the Iraqi Shiites' top leader, friend of Khomeini and longtime foe of Baathist rule.
Obama and his media flacks would have us believe that by speaking of American values and by distinguishing friend from foe, former president George W. Bush raised the hackles of the world against America.
Once you bring forces close together in face-to-face trench line, house-to-house fighting, it negates the use of much air support, especially as both sides have a lot of the same gear and it's very difficult to tell between friend and foe.
As political loyalties and alliances shift, a small people like the Jews must be willing to distinguish friend from foe.
How Rupert Murdoch turned from foe to friend in the eyes of China's leaders is also there, and is a salutary lesson.
Musial, who died on Saturday at the age of 92, had a long and storied career, and was generally loved by friend and foe alike.
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