(function () {
        var gads = document.createElement('script');
        gads.async = true;
        gads.type = 'text/javascript';
        var useSSL = 'https:' == document.location.protocol;
        gads.src = (useSSL ? 'https:' : 'http:') +
                '//www.googletagservices.com/tag/js/gpt.js';
        var node = document.getElementsByTagName('script')[0];
        node.parentNode.insertBefore(gads, node);
})();

var googletag = googletag || {};
googletag.cmd = googletag.cmd || [];

var pbjs = pbjs || {};
pbjs.que = pbjs.que || [];

var interstitialSlot;

googletag.cmd.push(function() {
  interstitialSlot = googletag.defineOutOfPageSlot(
      '/1006371/Article_Sidebar_1',
      googletag.enums.OutOfPageFormat.INTERSTITIAL);

if (interstitialSlot) {
    interstitialSlot.addService(googletag.pubads());
  }

googletag.pubads().enableSingleRequest();
});

apstag.init({
	pubID:'b5cc0920-f4a1-46b6-85cf-6178ca751e1a',
	adServer:'googletag'
});

googletag.cmd.push(function() {
        var REFRESH_KEY = 'refresh';
        var REFRESH_VALUE = 'true';

var mappingArticleTop = googletag.sizeMapping().
        addSize([1185, 0], [[728, 90]]).
        addSize([0, 0], [[300, 250]]).
        build();

var mappingArticleRepeat = googletag.sizeMapping().
        addSize([1185, 0], [[1, 2], [728, 90]]).
        addSize([0, 0], [[1, 2], [300, 250]]).
        build();

var mappingArticleSidebar1 = googletag.sizeMapping().
        addSize([0, 0], [[300, 250]]).
        build();

var mappingArticleSidebar2 = googletag.sizeMapping().
        addSize([0, 0], [[160, 600], [300, 600]]).
        build();

var mappingArticleBottom = googletag.sizeMapping().
        addSize([1185, 0], [[728, 90]]).
        addSize([0, 0], [[300, 250]]).
        build();

googletag.defineSlot('/1006371/Article_Top', [], 'Article_Top').defineSizeMapping(mappingArticleTop).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Repeat_1', [], 'Article_Repeat_1').defineSizeMapping(mappingArticleRepeat).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Repeat_2', [], 'Article_Repeat_2').defineSizeMapping(mappingArticleRepeat).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Repeat_3', [], 'Article_Repeat_3').defineSizeMapping(mappingArticleRepeat).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Repeat_4', [], 'Article_Repeat_4').defineSizeMapping(mappingArticleRepeat).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Repeat_5', [], 'Article_Repeat_5').defineSizeMapping(mappingArticleRepeat).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Bottom', [], 'Article_Bottom').defineSizeMapping(mappingArticleBottom).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Sidebar_1', [], 'Article_Sidebar_1').defineSizeMapping(mappingArticleSidebar1).addService(googletag.pubads());
        googletag.defineSlot('/1006371/Article_Sidebar_2', [], 'Article_Sidebar_2').defineSizeMapping(mappingArticleSidebar2).addService(googletag.pubads());
        googletag.defineSlot('/1006371/th_mobile_leaderboard_sticky', [320, 50], 'th_mobile_leaderboard_sticky').setTargeting(REFRESH_KEY, REFRESH_VALUE).addService(googletag.pubads());
        googletag.defineSlot('/1006371/NextMillennium_1x1', [1, 1], 'NextMillennium_1x1').addService(googletag.pubads());
        googletag.defineSlot('/1006371/OOP_1', [1, 1], 'OOP_1').addService(googletag.pubads());
        googletag.defineSlot('/1006371/OOP_2', [1, 1], 'OOP_2').addService(googletag.pubads());
        googletag.defineSlot('/1006371/OOP_3', [1, 1], 'OOP_3').addService(googletag.pubads());

googletag.pubads().setTargeting('post_id', '18763');
        googletag.pubads().setTargeting('post_cats', ['Uncategorized']);
        googletag.pubads().setTargeting('is_testing', 'no');

googletag.pubads().collapseEmptyDivs(true);
        googletag.pubads().setCentering(true);

var SECONDS_TO_WAIT_AFTER_VIEWABILITY = 45;

googletag.pubads().addEventListener('impressionViewable', function(event) {
            var slot = event.slot;
            if (slot.getTargeting(REFRESH_KEY).indexOf(REFRESH_VALUE) > -1) {
                setTimeout(function() {
                googletag.pubads().refresh([slot]);
              }, SECONDS_TO_WAIT_AFTER_VIEWABILITY * 1000);
            }
        });

googletag.enableServices();
});

var bidTimeout = 2000;

var adUnits = [Article_Top,Article_Repeat_1,Article_Repeat_2,Article_Repeat_3,Article_Repeat_4,Article_Repeat_5,Article_Bottom,Article_Sidebar_1,Article_Sidebar_2];

function fetchHeaderBids(){var e=["a9","prebid"],t={adserverRequestSent:!1};function s(s){!0!==t.adserverRequestSent&&("a9"===s?t.a9=!0:"prebid"===s&&(t.prebid=!0),e.map(function(e){return t[e]}).filter(Boolean).length===e.length&&n())}function n(){!0!==t.adserverRequestSent&&(t.adserverRequestSent=!0,pbjs.adserverRequestSent=!0,t.sendAdserverRequest=!0,googletag.cmd.push(function(){apstag.setDisplayBids(),pbjs.setTargetingForGPTAsync(),googletag.pubads().refresh()}))}e.forEach(function(e){t[e]=!1}),function(e,t,n){apstag.fetchBids({slots:e,timeout:n},function(e){s("a9")}),pbjs.que.push(function(){pbjs.addAdUnits(t),pbjs.requestBids({bidsBackHandler:function(e){s("prebid")}})})}(apstagSlots,adUnits,bidTimeout),window.setTimeout(function(){n()},bidTimeout)}

fetchHeaderBids(apstagSlots, adUnits, bidTimeout);

Free Admission to 392 National Parks This Weekend

In honor of National Parks Week (April 18th – April 26th), entrance to all 392 National Parks is free this weekend (April 18th and 19th)! Many parks are also offering special promotions for this week only. So if you don’t have any plans for the weekend yet, take a free trip to your local National Park. Apart from being free, it could be educational and rewarding.

Check out the National Park Service website for details.

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