It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
(visit the link for the full news article)
Of all the possible causes of the deadly collapse of Minnesota's Interstate 35W bridge earlier this month—uneven traffic patterns, de-icing salts, faulty construction—the latest is the most surprising: Pigeons. Or more precisely, the waste the birds leave behind. "Pigeon dung can be a serious issue—it's acidic and will easily eat away almost any metal," explains engineer William Schutt, president of Matcor, a corrosion-protection firm in Doylestown, Pa.