Avoid dirt smears or soap streaks when cleaning your windows, ... Keeping them free of dirt is important, both for aesthetic and hygienic reasons, and this should be a straightforward process.

Mysterious dark streaks first observed on Mars in the 1970s are not what many believed they were.. Scientists now say the curious features that stretch for hundreds of meters down Martian slopes ...

Satellite images suggest long, dark streaks on Mars may not actually be related to water on the Red Planet. Skip to main content. Open menu Close menu. Space. Search. Search Space. Sign in.

A new study casts doubt on a phenomenon that was previously believed to show water flowing on the surface of Mars. Since the 1970s, scientists have studied dark streaks seen on Mars' cliff sides ...