Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
calestous's profile
Calestous Juma
Calestous Juma
Calestous Juma
Verified account
@calestous

Tweets

Calestous JumaVerified account

@calestous

Professor @BelferCenter @KennedySchool @Harvard | A New Culture of Innovation: Technology, Entrepreneurship and Prosperity (forthcoming book)

bit.ly/2sG3K0T
Joined April 2009

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    Calestous Juma‏Verified account @calestous 25 Jul 2017

    #Innovation: This #laser evaporates rust and dirt without damaging underlying metal >@ShaunCoffey #engineering #technology #physicspic.twitter.com/Cpdt8rnTFU

    2:44 PM - 25 Jul 2017
    • 257 Retweets
    • 297 Likes
    • Adwin Spring Co Ltd Mark Dolling David Slade Mann IP Boyd Carter Stephen Cox Shadow Copper Simon Zacher Peternegus1
    16 replies 257 retweets 297 likes
      1. New conversation
      2. Emilie‏ @paintsandsings 25 Jul 2017
        Replying to @calestous @ShaunCoffey

        I'm thinking that the Sydney Harbour Bridge could use this ! 😀

        1 reply 1 retweet 0 likes
      3. Calestous Juma‏Verified account @calestous 25 Jul 2017
        Replying to @paintsandsings @ShaunCoffey

        Will need a bigger version for that :)

        0 replies 1 retweet 1 like
      4. End of conversation
      1. New conversation
      2. Pete Moring‏ @PeteMoring 26 Jul 2017
        Replying to @calestous @ShaunCoffey

        BLIMEY!! Another invention we need to keep away from those who can't get hold of #Guns EH?? 💀💀

        1 reply 1 retweet 0 likes
      3. Scott Grant‏ @onesideofthesea 26 Jul 2017
        Replying to @PeteMoring @calestous @ShaunCoffey

        Because people without guns will recklessly strip rust instead??

        1 reply 1 retweet 3 likes
      4. Pete Moring‏ @PeteMoring 26 Jul 2017
        Replying to @onesideofthesea @calestous @ShaunCoffey

        Now-Now ... don't be #Silly .... you don't get Rusty People :-)

        0 replies 0 retweets 0 likes
      5. End of conversation
      1. New conversation
      2. Ali Mohammed‏ @AlleyMb 27 Jul 2017
        Replying to @calestous @reginalddhunter @ShaunCoffey

        Would you be interested in how nature creates lightning & for it to be created as such? #cleanenergy4all I ask as seeking support.

        2 replies 1 retweet 0 likes
      3. Ali Mohammed‏ @AlleyMb 27 Jul 2017
        Replying to @AlleyMb @calestous and

        H2o, H, e- & EMF+ = Lightning. Understanding Maxwell, Bloch, Farraday laws then data analysis with calculations, leading to experiment.

        0 replies 1 retweet 1 like
      4. End of conversation
      1. Geology 2019‏ @geology2018 5 Aug 2017
        Replying to @calestous @ScalareSorpasso @ShaunCoffey

        Awesome Invention

        0 replies 1 retweet 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Stuart McKenzie‏ @stuart_mckenzie 26 Jul 2017
        Replying to @calestous @BjornLomborg @ShaunCoffey

        Very cool - well done!

        0 replies 1 retweet 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Ifiok James‏ @Ifijay 26 Jul 2017
        Replying to @calestous @ShaunCoffey

        Wow. Cool innovation

        0 replies 1 retweet 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Simon‏ @baldejock 26 Jul 2017
        Replying to @calestous @reginalddhunter @ShaunCoffey

        Does it work on fake tan? If it does let's do the Donald

        0 replies 0 retweets 1 like
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Colonel_C‏ @t_Tumnus 26 Jul 2017
        Replying to @calestous @reginalddhunter @ShaunCoffey

        Does it work on chlorinated chicken?

        0 replies 0 retweets 1 like
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Katharine P.‏ @nexus7669 25 Jul 2017
        Replying to @calestous @ShaunCoffey

        Gotta get my dad one of these, he used to fix airplanes and sure used alot of WD40, chemicals and sandpaper to strip metal

        0 replies 1 retweet 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Casper‏ @Casper10666 25 Jul 2017
        Replying to @calestous @IndigoFast @ShaunCoffey

        thats impressive

        0 replies 1 retweet 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Darin Nooren‏ @DefinitionDarin 27 Jul 2017
        Replying to @calestous @ShaunCoffey

        How much for that model?

        0 replies 0 retweets 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Gen. Chang's Chicken‏ @Chowdertron 26 Jul 2017
        Replying to @calestous @BjornLomborg @ShaunCoffey

        I want.

        0 replies 0 retweets 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. Jacques Towakí‏ @JaquesTowaki1 26 Jul 2017
        Replying to @calestous @ShaunCoffey

        Love this! Can someone come up with something similar for wood?! 😃

        0 replies 0 retweets 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. New conversation
      2. Katharine P.‏ @nexus7669 25 Jul 2017
        Replying to @calestous @ShaunCoffey

        Wow

        1 reply 0 retweets 0 likes
      3. Katharine P.‏ @nexus7669 25 Jul 2017
        Replying to @nexus7669 @calestous @ShaunCoffey

        Alien tech?

        0 replies 0 retweets 0 likes
      4. End of conversation

    Loading seems to be taking a while.

    Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

      Promoted Tweet

      false

      • © 2018 Twitter
      • About
      • Help Center
      • Terms
      • Privacy policy
      • Cookies
      • Ads info