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Water cascades down a spillway, creating a smooth waterfall effect, in South Korea

BRK24B83_400

Water cascades down a spillway, creating a smooth ...

Closeup of paddle-wheels being used to aerate rural pond with green foliage on shoreline

BRK24A75_316

Closeup of paddle-wheels being used to aerate rura...

Paddle-wheels being used to aerate rural pond with green foliage on shoreline

BRK24A72_421

Paddle-wheels being used to aerate rural pond with...

Windows

BRK22I60_266

Windows

Bed linen is for airing in the open window

BRK23A47_183

Bed linen is for airing in the open window

Bed linen is for airing in the open window

BRK23A47_209

Bed linen is for airing in the open window

Bottom of passenger airplane isolated on a white background

BRK22C71_455

Bottom of passenger airplane isolated on a white b...

Unmanned aircraft system

BRK22C77_049

Unmanned aircraft system

Clark's anemonefish

BRK22C97_116

Clark's anemonefish

Half-timbered houses

BRK22B46_249

Half-timbered houses

Wonderful adventure

BRK21D84_200

Wonderful adventure

Surrealistic image as a man stand in a foggy street under a huge levitating rock

BRK21D85_126

Surrealistic image as a man stand in a foggy stree...

Beautiful sunset landscape

BRK21D89_103

Beautiful sunset landscape

Winter holidays illustration of a isolated dreamland

BRK21D91_308

Winter holidays illustration of a isolated dreamla...

Metallic wire mesh magic transformation into flying birds over sunset sky background

BRK21D94_427

Metallic wire mesh magic transformation into flyin...

Magic cup in a cold winter day with snowy forest and mounts inside

BRK21D95_102

Magic cup in a cold winter day with snowy forest a...

A lot of seeds escape from a dandelion flower on a gray backround

BRK21D85_114

A lot of seeds escape from a dandelion flower on a...

Purple hot air balloon flying over the mountains. Flat design

BRK21D08_039

Purple hot air balloon flying over the mountains. ...

A lot of seeds escape from a dandelion flower on blue sky background. Vector illustration

BRK21D11_108

A lot of seeds escape from a dandelion flower on b...

Teaching physics with open windows in an 8th grade class at the Robert-Havemann-Gymnasium in Karow

BRK20B07_049

Teaching physics with open windows in an 8th grade...

Campaign poster Nur Lueften hilft der Schuelerfirma energyECO at Robert-Havemann-Gymnasium in Karow

BRK20B06_353

Campaign poster Nur Lueften hilft der Schuelerfirm...

In a physics room at the Robert-Havemann-Gymnasium in Karow

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In a physics room at the Robert-Havemann-Gymnasium...

Measuring device for checking the quality of indoor air in offices

BRK20A99_224

Measuring device for checking the quality of indoo...

Measuring device for checking the quality of indoor air in offices

BRK20B00_127

Measuring device for checking the quality of indoo...

Measuring device for checking the quality of indoor air in offices

BRK20B00_327

Measuring device for checking the quality of indoo...

Measuring device for checking the quality of indoor air in offices

BRK20B00_328

Measuring device for checking the quality of indoo...

Measuring device for checking the quality of indoor air in offices

BRK20A99_429

Measuring device for checking the quality of indoo...

Ventilation in schools

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Ventilation in schools

Ventilation in schools

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Ventilation in schools

Ventilation in schools

BRK20A99_029

Ventilation in schools

Letter stones with many different coloured game pieces in a small space

BRK20A95_382

Letter stones with many different coloured game pi...

Ventilation in schools

BRK20B00_336

Ventilation in schools

Airing in a classroom

BRK20A93_197

Airing in a classroom

Airing in a classroom

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Airing in a classroom

Airing in a classroom

BRK20A91_379

Airing in a classroom

Airing in a classroom

BRK20A93_399

Airing in a classroom

Letter stones on a wooden strip

BRK20A96_291

Letter stones on a wooden strip

Letter blocks with many different coloured game pieces in a small space

BRK20A95_179

Letter blocks with many different coloured game pi...

Ventilation in school

BRK20A92_493

Ventilation in school

Dice cup with letter cubes

BRK20A94_289

Dice cup with letter cubes

Airing in a classroom

BRK20A94_479

Airing in a classroom

Ventilation in school

BRK20A96_290

Ventilation in school

Ventilation in a classroom

BRK20A96_479

Ventilation in a classroom

Ventilation in school

BRK20A94_480

Ventilation in school

Ventilation in a classroom

BRK20A97_394

Ventilation in a classroom

Ventilation in school

BRK20A98_278

Ventilation in school

Dice cup with letter cubes

BRK20A97_195

Dice cup with letter cubes

Letter stones in a row

BRK20A98_281

Letter stones in a row

Letter stones with many blurred figures in a small space

BRK20A98_282

Letter stones with many blurred figures in a small...

Empty classroom

BRK20A86_473

Empty classroom

Woman sitting in the office with the window open

BRK20A90_344

Woman sitting in the office with the window open

Person opens window in office and wants to air

BRK20A88_458

Person opens window in office and wants to air

Woman sitting in the office with the window open

BRK20A90_042

Woman sitting in the office with the window open

Person opens window in office and wants to air

BRK20A89_155

Person opens window in office and wants to air

An open window in the office

BRK20A90_376

An open window in the office

Ventilation

BRK20A86_487

Ventilation

Ventilation

BRK20A87_192

Ventilation

Teacher with thick winter jacket

BRK20A86_489

Teacher with thick winter jacket

Teacher with a thick winter jacket

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Teacher with a thick winter jacket

Teacher with thick winter jacket

BRK20A87_185

Teacher with thick winter jacket

Teacher with thick winter jacket

BRK20A86_290

Teacher with thick winter jacket

Teacher with thick winter jacket

BRK20A87_184

Teacher with thick winter jacket

Teacher with thick winter jacket

BRK20A86_488

Teacher with thick winter jacket

Teacher with thick winter jacket and face mask in classroom teaching

BRK20A87_168

Teacher with thick winter jacket and face mask in ...

Teacher with thick winter jacket and face mask in classroom teaching

BRK20A88_030

Teacher with thick winter jacket and face mask in ...

Teacher with thick winter jacket

BRK20A88_042

Teacher with thick winter jacket

Teacher with thick winter jacket and face mask in classroom teaching

BRK20A86_277

Teacher with thick winter jacket and face mask in ...

Teacher with thick winter jacket and face mask in classroom teaching

BRK20A87_169

Teacher with thick winter jacket and face mask in ...

White stork (Ciconia ciconia) airs its plumage

BRK20A27_471

White stork (Ciconia ciconia) airs its plumage

White stork (Ciconia ciconia) airs its plumage

BRK20A29_245

White stork (Ciconia ciconia) airs its plumage

Historical Reepschlaegerhaus of 1758

BRK19H14_413

Historical Reepschlaegerhaus of 1758

Bedding hanging from three windows for airing

BRK18A65_431

Bedding hanging from three windows for airing